Cathedral city where box given to queen (7)
I believe the answer is:
chester
'cathedral city' is the definition.
(city with a cathedral)
'box given to queen' is the wordplay.
'box' becomes 'chest' (chest is a kind of box).
'given to' says to put letters next to each other.
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'chest'+'er'='CHESTER'
'where' acts as a link.
(Other definitions for chester that I've seen before include "Tetchy cries (anag)" , "diocese" , "Walled English city" , "County town south of Liverpool" , "Cathedral city" .)