Queen in synopsis, no problem! (4)
I believe the answer is:
mary
'queen' is the definition.
(Mary I or Mary II)
'synopsis no problem' is the wordplay.
'synopsis' becomes 'summary' (I've seen this before).
'no' suggests deleting specific letters.
'problem' becomes 'sum' (arithmetic problem).
'summary' with 'sum' taken away is 'MARY'.
'in' acts as a link.
(Other definitions for mary that I've seen before include "Person venerated by Christians" , "See 2" , "could be Wesley" , "Sinner who became a follower of Jesus" , "feature of 21/23 [NATIVITY SCENE]" .)