Excellent portion of beef in eatery (4)
I believe the answer is:
fine
'excellent' is the definition.
(synonyms)
'portion of beef in eatery' is the wordplay.
'portion of' indicates a hidden word.
'FINE' is hidden within 'beef in eatery'.
(Other definitions for fine that I've seen before include "Fair - penalty" , "charge" , "Dry and sunny" , "Splendid - financial penalty" , "Monetary penalty inflicted by law" .)