Hanging on to the darn fish! (8)
I believe the answer is:
dangling
'hanging' is the definition.
(I know that hanging can be written as dangling)
'on to the darn fish' is the wordplay.
'on' is a charade indicator (letters next to each other).
'to the darn' becomes 'dang' (I've seen this in another clue).
'fish' becomes 'ling' (ling is a kind of fish).
'dang' put next to 'ling' is 'DANGLING'.
(Other definitions for dangling that I've seen before include "Disconnected" , "Offering" , "Hanging loosely, swinging or swaying" .)