Credit card at last found in market returned (5)
I believe the answer is:
kudos
'credit' is the definition.
(I've seen this before)
'card at last found in market returned' is the wordplay.
'at last' indicates one should take the final letters.
'found in' means one lot of letters goes inside another.
'market' becomes 'souk' (souk is a kind of market**).
'returned' shows that the letters should be reversed in order.
The last letter of 'card' is 'd'.
'd' put inside 'souk' is 'soduk'.
'soduk' reversed gives 'KUDOS'.
(Other definitions for kudos that I've seen before include "Informal honour of glory" , "'Credit, honour or prestige (5)'" , "Acclaim" , "Renown" , "Praise and honours" .)