Supreme lover, mostly not lacking love (9)

I believe the answer is:

paramount

I'm a little stuck... Click here to teach me more about this clue!

'supreme' is the definition.
(I've seen this before)

'lover mostly not lacking love' is the wordplay.
'lover' becomes 'paramour' (term for a lover).
'mostly' means to remove the last letter (most but not all of the word).
'not lacking love' becomes 'nt' (I can't explain this - if you can you should believe this answer much more).
'paramour' with its last letter taken away is 'paramou'.
'paramou'+'nt'='PARAMOUNT'

Can you help me to learn more?

(Other definitions for paramount that I've seen before include "More important than anything else" , "Supreme - Hollywood studio" , "Pre-eminent - movie maker" , "Chief in importance, supreme" , "Of overriding importance" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.