Gentle one moved by 'blubber queen' nickname (9)
I believe the answer is:
sobriquet
'nickname' is the definition.
(synonyms)
'gentle one moved by blubber queen' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'blubber' could be 'sob' (I've seen this before) and 'sob' is located in the answer.
'queen' could be 'qu' (abbreviation for queen) and 'qu' is present in the answer.
The remaining letters 'ret' 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 sobriquet that I've seen before include "Byname -- Boers quit (anag)" , "A different name" , "Person's nickname" , "Nickname -- Boers quit (anag)" , "dubious name" .)