Nickname that's very posh on lighter (10)

I believe the answer is:

soubriquet

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

'nickname' is the definition.
(I know that nickname can be written as soubriquet)

'very posh on lighter' is the wordplay.
'very' becomes 'so' (both can mean 'extremely').
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'on lighter' becomes 'briquet' (I can't justify this - if you can you should believe this answer much more).
'so'+'u'+'briquet'='SOUBRIQUET'

'that's' is the link.

Can you help me to learn more?

(Another definition for soubriquet that I've seen is " Nickname".)

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.