Some champagne for poor actor (3)
I believe the answer is:
ham
'poor actor' is the definition.
(ham can mean a bad or over-the-top actor)
'some champagne for' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'HAM' is hidden in the letters of 'champagne for'.
(Other definitions for ham that I've seen before include "one rescued from flood" , "Flamboyant actor, meaty type" , "Cured pig's meat" , "Meat of the hog" , "Overacting actor" .)