Dealers surprisingly starred (7)
I believe the answer is:
traders
'dealers' is the definition.
(I know this)
'surprisingly starred' is the wordplay.
'surprisingly' indicates anagramming the letters (a surprising ordering of the letters).
'starred' is an anagram of 'TRADERS'.
(Other definitions for traders that I've seen before include "businessmen" , "Sellers" , "Dealers" .)