Comic actor with Queen frequenting shops where goldfish bought? (5,7)
I believe the answer is:
peter sellers
'comic actor' is the definition.
(British actor)
'queen frequenting shops where goldfish bought?' is the wordplay.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'frequenting' indicates putting letters inside (frequent can mean to visit or go into).
'shops where goldfish bought?' becomes 'petsellers' (shops which sell pets).
'er' going within 'petsellers' is 'PETER SELLERS'.
'with' acts as a link.
(Other definitions for peter sellers that I've seen before include "Inspector Clouseau and leading Goon" , "Old actor" , "A Goon; Clouseau actor" .)