Crossword Genius

Bricklayer's goo

Ross

I believe the answer is:

mortar

(Other definitions for mortar that I've seen before include "Bonding material for bricks" , "Brick bonding; a cannon" , "Bonding for brickwork - small cannon" , "Gun; brick bond" , "16's grinding partner" .)

I've seen this clue in The Mirror.
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