It cuts down the light coming from headlamps (9)

I believe the answer is:

lampshade

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'it cuts down the light coming' is the definition.
The definition suggests a singular noun which matches the answer.

'from headlamps' is the wordplay.
'from' indicates anagramming the letters (the anagram comes from the same letters).
'headlamps' is an anagram of 'LAMPSHADE'.

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(Other definitions for lampshade that I've seen before include "To give light cover" , "bit of furniture" , "light fitting" , "Cover for domestic light" , "Cover for bulb" .)

I've seen this clue in The Globe and Mail.

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