Rope in mate, the roofer (6)
I believe the answer is:
tether
'rope' is the definition.
(I've seen this in another clue)
'in mate the roofer' is the wordplay.
'in' says the answer is hidden in the clue.
'TETHER' is hidden in the letters of 'mate the roofer'.
(Other definitions for tether that I've seen before include "restricts movement" , "Rope for tying animal" , "Rope to fasten grazing animal" , "Restricting rope, chain" , "Tie with rope or chain" .)