In danger of falling off (5)
I believe the answer is:
loose
'in danger of falling off' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for loose that I've seen before include "Promiscuous" , "Not bound" , "(Of a garment) a size too big?" , "Lax or at large" , "Hanging" .)