Puzzle

 ACROSS

  1 Basics

  5 Was in debt

  9 Hubbubs

 13 Sudden transition

 14 Extend the due date of

 16 State after Indiana, alphabetically

 17 Volcano flow

 18 With 61-Across, homes that often have great views ... or a possible description of the starred answers?

 20 Blow off steam

 22 Blew off steam

 23 *Sailor's song, as some spell it

 26 "Measure twice, cut once," e.g.

 29 Screw up

 30 Fertility clinic cells

 31 Green Bay-to-Dallas dir.

 33 Archaeological site

 34 Ballpark figure

 37 "Sadly not"

 39 *Turning point

 41 Pastry often filled with potatoes and peas

 44 Weak spot for a boxer

 48 Altar affirmation

 49 Sra., in the U.S.

 51 E-filing org.

 52 Quarter of four

 53 Made a dash for

 55 *Wetland with cyclical flooding

 58 Turk's neighbor

 60 Shout

 61 See 18-Across

 65 What the Swahili word "simba" means

 67 Orchestra woodwind

 68 Its capital is Nairobi

 69 Parts of a journey

 70 Sail's force?

 71 Bias

 72 "Game of Thrones" girl

DOWN

  1 Word before "natural" or "inclusive"

  2 Busy ones, metaphorically

  3 Works on walls?

  4 Reaches across

  5 Crystal ball, e.g.

  6 Teensy

  7 Bring into law

  8 Fake ducks

  9 Was shown on TV

 10 Gadgets

 11 Possess

 12 Warmed the bench

 15 Personal question?

 19 With no imperfections

 21 Saint who wrote "Utopia"

 23 Notice

 24 Video game persona

 25 Silver of FiveThirtyEight

 27 The "G" in G&T

 28 A compliment may boost it

 32 World's largest hot desert

 35 ___ Jima

 36 Unit of work

 38 Some online pop-ups

 40 Approached a base feet-first

 41 Knight's address

 42 Mathematician Lovelace

 43 Indian season known for downpours

 45 More like St. Nicholas

 46 One often has four colons

 47 Sodden

 50 Liquid, solid and gas, for matter

 54 Drafted an email, say

 56 Written with a pen

 57 Gent

 59 Grate on

 61 Superhero punch sound

 62 One of 2,297 for Hank Aaron: Abbr.

 63 Pupil's place

 64 Tool with a chain variety

 66 Code-breaking org.

Solution