Crossword Genius

Putty-like substance (6)

Ross

I believe the answer is:

mastic

(Other definitions for mastic that I've seen before include "Gum from trees" , "Mouldable cement" , "Putty-like cement used as adhesive or filler" , "Resin used in varnishes" , "Mac, sit and produce a gum resin" .)

I've seen this clue in the Evening Standard and The Mirror.
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