Crossword Genius

Many lights used in the theatre (6)

Ross

I believe the answer is:

clamps

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

'in the theatre' is the definition.
I can't judge whether this definition defines the answer.

'many lights' is the wordplay.
'many' becomes 'c' (C is the Roman numeral for 100).
'lights' becomes 'lamps' (lamp is a kind of light).
'c'+'lamps'='CLAMPS'

'used' acts as a link.

Can you help me to learn more?

(Other definitions for clamps that I've seen before include "fasteners" , "Devices to hold things, car wheels say" , "Devices to hold things firmly, car-wheels say" , "Holds tightly with device - illegally parked cars? (6)" , "Grips" .)

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