Freedom for queen to tuck into drink (10)
I believe the answer is:
liberation
'freedom' is the definition.
(thesaurus)
'queen to tuck into drink' is the wordplay.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'to tuck into' means one lot of letters goes inside another.
'drink' becomes 'libation' (libation is a kind of drink**).
'er' inserted inside 'libation' is 'LIBERATION'.
'for' acts as a link.
(Other definitions for liberation that I've seen before include "Act of freeing" , "Release" , "Act of setting free" , "Deliverance" .)