Crossword Genius

Window supporter of little substance (8)

Ross

I believe the answer is:

fanlight

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

'window' is the definition.
(I know that fanlight is a type of window)

'supporter of little substance' is the wordplay.
'supporter' becomes 'fan' (fan is a kind of supporter).
'of little substance' becomes 'light' (I can't justify this - if you can you should believe this answer much more).
'fan'+'light'='FANLIGHT'

Can you help me to learn more?

(Other definitions for fanlight that I've seen before include "Small window" , "It enables us to see" , "opening over the door" , "elevated aperture" , "Windows above a door" .)

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