Crossword Genius

Putty-style sealant (6)

Ross

I believe the answer is:

mastic

(Other definitions for mastic that I've seen before include "liquor" , "Mouldable cement" , "Gum from trees" , "Substance applied to joints" , "Putty-like cement used as adhesive or filler" .)

I've seen this clue in The Guardian.
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