Confined dodgy dealer on the day (6)
I believe the answer is:
fenced
'confined' is the definition.
(thesaurus)
'dodgy dealer on the day' is the wordplay.
'dodgy dealer' becomes 'fence' (trader of stolen goods).
'on' says to put letters next to each other.
'the day' becomes 'd' (abbreviation for day).
'fence'+'d'='FENCED'
(Other definitions for fenced that I've seen before include "Enclosed with a palisade" , "Fought with sword" , "Was receiver" , "Enclosed as with bushes" , "Ringed in as with bushes" .)