Bricklayer's cement (6)
I believe the answer is:
mortar
'bricklayer's cement' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mortar that I've seen before include "Bond for bricks; weapon" , "Cement mix" , "Brick-joining material or short cannon" , "Bonding material for bricks" , "Bomb-firing weapon" .)