Note meagre light (4)

I believe the answer is:

glow

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'light' is the definition.
(I know that glow is a type of light)

'note meagre' is the wordplay.
'note' becomes 'g' (musical note).
'meagre' becomes 'low' (I can't justify this - if you can you should give a lot more credence to this answer).
'g'+'low'='GLOW'

Can you help me to learn more?

(Other definitions for glow that I've seen before include "Gentle, warm light" , "Brightness" , "Burn without flame" , "Emanate light" , "Radiate or redden" .)

I've seen this clue in The Mirror.

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