MASTIC

Putty-like cement used as adhesive or filler (6)

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

• Quick crossword No 16,095 — 2021-12-07 00:00:12
  16D: Putty-style sealant (6)
• Quick crossword No 15,563 — 2020-03-25 00:00:43
  14A: Putty-like cement used as adhesive or filler (6)