BOAST

Blow one's own trumpet (5)

Solution has appeared in 3 crosswords (2 across and 1 down):

• Quick crossword No 16,108 — 2021-12-22 00:00:11
  11A: Show off exaggeratedly (5)
• Quick crossword No 15,768 — 2020-11-19 00:00:57
  18D: Brag (5)
• Quick crossword No 15,534 — 2020-02-20 00:00:09
  8A: Blow one's own trumpet (5)