Tack together (5)
I believe the answer is:
baste
'tack together' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for baste that I've seen before include "Looking at with interest" , "Keep moisturised when baking" , "Moisten with gravy" , "Moisten with hot fat" , "Loosely stitch" .)