Found one in leading role with sheep (5,2)
I believe the answer is:
start up
'found' is the definition.
(thesaurus)
'one in leading role with sheep' is the wordplay.
'one in leading role' becomes 'star' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'with' is a charade indicator (letters next to each other).
'sheep' becomes 'tup' (tup is a kind of sheep).
'star'+'tup'='START-UP'
Can you help me to learn more?
(Other definitions for start up that I've seen before include "Newly created business" , "newly formed company" , "get going" , "Action of initiating" , "fresh concern" .)