Crossword Genius

Switch unit to join fight (4,3)

Ross

I believe the answer is:

fuse box

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'switch unit' is the definition.
The definition suggests a singular noun which matches the answer.

'join fight' is the wordplay.
'join' becomes 'fuse'.
'fight' becomes 'box' (boxing is a kind of fighting).
'fuse'+'box'='FUSE BOX'

'to' acts as a link.

Can you help me to learn more?

(Another definition for fuse box that I've seen is " Container for electrical safety devices".)

I've seen this clue in The Guardian.
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