Money smuggled into football club (5)
I believe the answer is:
franc
'money' is the definition.
(I've seen this before)
'smuggled into football club' is the wordplay.
'smuggled' becomes 'ran' (I've seen this in other clues).
'into' is an insertion indicator.
'football club' becomes 'FC'.
'ran' going into 'fc' is 'FRANC'.
(Other definitions for franc that I've seen before include "Foreign capital" , "for laying out in Luxembourg" , "It's ready" , "Nonsense (colloq.)" , "Old French money" .)