Volunteer no longer liking queen? (5)
I believe the answer is:
'volunteer' is the definition.
(I know that volunteer can be written as offer)
'no longer liking queen?' is the wordplay.
'no' becomes 'O' (resembles 0 - 'no' can mean 'zero').
'longer liking' becomes 'ff' (I am not sure about this - if you are sure you should believe this answer much more).
'queen?' becomes 'ER' (abbreviation for Elizabeth Regina).
Can you help me to learn more?
(Other definitions for offer that I've seen before include "Tender, make bid for" , "(Suggestion of) gift" , "killer?" , "Tender, volunteer" , "Proposal (of marriage)" .)