Supporter restored by queen (6)
I believe the answer is:
backer
'supporter' is the definition.
(I know that backer is a type of supporter)
'restored by queen' is the wordplay.
I cannot really understand how this works, but
'queen' could be 'er' (abbreviation for Elizabeth Regina) and 'er' is found within the answer.
The remaining letters 'back' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for backer that I've seen before include "Sponsor" , "Person supporting another financially" , "Angel" , "Financial supporter" , "'Supporter, usually provides finance (6)'" .)