Star's first with generous model (6)
I believe the answer is:
sample
'model' is the definition.
(model can mean a prototype or sample)
'star's first with generous' is the wordplay.
'star's first' becomes 's' (1st letter of 'star').
'with' is a charade indicator (letters next to each other).
'generous' becomes 'ample' (similar in meaning).
's'+'ample'='SAMPLE'
(Other definitions for sample that I've seen before include "Taste; specimen" , "Small part used to represent the whole" , "Taste(r)" , "Specimen, try out" , "Experience" .)