Guinea coin smuggled into football club (5)
I believe the answer is:
franc
'guinea coin' is the definition.
(currency of Guinea)
'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 within 'fc' is 'FRANC'.
(Other definitions for franc that I've seen before include "Swiss loot" , "Historic currency" , "Former French monetary unit" , "Swiss capital" , "Swiss coin" .)