Ultimately smart suit needed for creative activities (3,4)

'creative activities' is the definition.
(the arts are creative pursuits)

'ultimately smart suit needed' is the wordplay.
'ultimately' indicates one should take the final letters.
'suit' becomes 'hearts' (hearts is a playing card suit).
'needed' means one lot of letters go next to another.
The final letter of 'smart' is 't'.
't'+'hearts'='THE ARTS'

'for' is the link.