Fellow managed to get caught with old money (5)
I believe the answer is:
franc
'old money' is the definition.
(I've seen this before)
'fellow managed to get caught' is the wordplay.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'managed to get' becomes 'ran' (I've seen this in other clues).
'caught' becomes 'c' (cricket abbreviation).
'f'+'ran'+'c'='FRANC'
'with' acts as a link.
(Other definitions for franc that I've seen before include "Old European currency" , "Old French coin" , "Swiss monetary unit" , "Historic currency" , "Swiss coin" .)