It may light up half the arcade (3)

I believe the answer is:

arc

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'it may light up' is the definition.
The definition suggests a singular noun which matches the answer.

'half the arcade' is the wordplay.
'half the' suggests halving the letters.
'arcade' cut in half is 'ARC'.

Can you help me to learn more?

(Other definitions for arc that I've seen before include "Part of a circular line" , "circle, partly" , "bends?" , "A curve; a discharge" , "section of Circle Line" .)

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

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