Money from poor holding on (5)
I believe the answer is:
bread
'money' is the definition.
(bread is slang for money)
'poor holding on' is the wordplay.
'poor' becomes 'bad' (similar in meaning).
'holding' is an insertion indicator.
'on' becomes 're' ('on' can be mean 'with reference to').
'bad' placed around 're' is 'BREAD'.
'from' acts as a link.
(Other definitions for bread that I've seen before include "Staple diet" , "It may be made from meal" , "Money (inf)" , "rhino" , "Eg, loaf or rolls" .)