Crossword Genius

What's needed to repair small cut on revolving belt? (5,5)

Ross

I believe the answer is:

spare parts

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

'what's needed to repair small' is the definition.
I can't tell whether this defines the answer.

'cut on revolving belt?' is the wordplay.
'cut on' becomes 'spare' (I can't explain this - if you can you should give a lot more credence to this answer).
'revolving' says the letters should be written backwards.
'belt?' becomes 'strap' (I've seen this in another clue).
'strap' reversed gives 'parts'.
'spare'+'parts'='SPARE PARTS'

Can you help me to learn more?

(Other definitions for spare parts that I've seen before include "accessories" , "Don't be merciless on everything" , "such may effect repair" , "Pare straps (anag.)" , "offered for replacements" .)

I've seen this clue in The Independent.
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