Special buckets perhaps for wrenches (7)

I believe the answer is:

sprains

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'for wrenches' is the definition.
(sprain is a kind of wrench)

'special buckets' is the wordplay.
'special' becomes 'sp' (abbreviation).
'buckets' becomes 'rains' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sp'+'rains'='SPRAINS'

'perhaps' acts as a link.

Can you help me to learn more?

(Another definition for sprains that I've seen is " Wrenches (a joint)".)

I've seen this clue in The Times.

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