Undo (7)
'undo' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for reverse that I've seen before include "Tails (of a coin)" , "Move backwards" , "Do u-turn to reserve" , "Change" , "Go in the opposite direction" .)
'undo' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for loosen that I've seen before include "Untie, relax" , "Make less tight, slacken" , "Relax the tension" , "Work free" , "relax or tear apart" .)
'undo' is the definition.
(unfastening is a kind of undoing)
This is the entire clue.
(Other definitions for unfasten that I've seen before include "Unlock" , "Nun's fate (anag.)" , "tie? No" , "Let go" , "Loosen or open, say seatbelt" .)