Crossword Genius

More buoyant match (7)

Ross

I believe the answer is:

lighter

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

'more buoyant' is the definition.
('light' can be similar in meaning to 'buoyant')

'match' is the wordplay.
I cannot really understand how this works, but
'match' could be 'light' (I've seen this before) and 'light' is found in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for lighter that I've seen before include "Flat-bottomed barge - not so heavy" , "The girl (anag.)" , "Substitute for match" , "Fire-raiser" , "Smoker's implement" .)

I've seen this clue in the Sydney Morning Herald.
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