Crossword Genius

Frivolous boxer (11)

Ross

I believe the answer is:

lightweight

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

'frivolous boxer' is the definition.
'lightweight' can be an answer for 'boxer' (lightweight is a kind of boxer). I am not sure about the 'frivolous' bit.

'frivolous boxer' is the wordplay.
'frivolous' becomes 'light' (light can mean trivial or unimportant).
'boxer' becomes 'weight' (I can't explain this - if you can you should give a lot more credence to this answer).
'light'+'weight'='LIGHTWEIGHT'

Can you help me to learn more?

(Other definitions for lightweight that I've seen before include "Fighter" , "Of little substance" , "Insubstantial" , "Carrying little punch?" , "of little importance" .)

I've seen this clue in The Mirror.
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