Sheepish round wine-producer (5)
I believe the answer is:
ovine
'sheepish' is the definition.
(thesaurus)
'round wine-producer' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'wine producer' becomes 'vine'.
'o'+'vine'='OVINE'
(Other definitions for ovine that I've seen before include "like a mug" , "1/6 = 2/3 of 28 [SHEEPISH" , "Relating to sheep" , "Resembling a sheep" , "Pertaining to sheep" .)