Bit of a blighter, but no 'heavy' (5)

I believe the answer is:

light

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'no heavy' is the definition.
'light' can be an answer for 'heavy' (thesaurus). I'm not certain of the 'no' bit.

'bit of a blighter but' is the wordplay.
'bit of' indicates a hidden word.
'LIGHT' is hidden in the letters of 'blighter but'.

Can you help me to learn more?

(Other definitions for light that I've seen before include "Unimportant" , "not profound" , "Person of authority" , "Flimsy" , "Match - agile - easily digested" .)

I've seen this clue in the Evening Standard.

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