Steal and occasionally deal in coin (6)
I believe the answer is:
nickel
'coin' is the definition.
(I know that nickel is a type of coin)
'steal and occasionally deal' is the wordplay.
'steal' becomes 'nick' (nick can informally mean to steal).
'and' is a charade indicator (letters next to each other).
'occasionally' means one should take alternating letters.
The alternate letters of 'deal' are 'el'.
'nick'+'el'='NICKEL'
'in' is the link.
(Other definitions for nickel that I've seen before include "US five cent piece" , "very little money" , "Sliver of wood/glass" , "US coin worth five cents" , "Silvery white metal" .)