Queen tucked into sandwich in larder (7)
I believe the answer is:
buttery
'larder' is the definition.
('buttery' can be a synonym of 'larder')
'queen tucked into sandwich' is the wordplay.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'tucked into' is an insertion indicator.
'sandwich' becomes 'butty' (I've seen this before).
'er' going into 'butty' is 'BUTTERY'.
'in' acts as a link.
(Other definitions for buttery that I've seen before include "Like a dairy spread" , "Where students could get food" , "Food store" , "larder" , "Room for food and wine storage" .)