Crossword Genius

Glazier’s thick paste (5)

Ross

I believe the answer is:

putty

(Other definitions for putty that I've seen before include "Malleable form of glas holder" , "Window fixer" , "Whiting and linseed oil paste" , "Window glass sealant" , "Window-sealing paste" .)

I've seen this clue in The Times.
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