Supply power to breakdown equipment (3,4)
I believe the answer is:
towrope
'breakdown equipment' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'supply power to' is the wordplay.
'supply' is an anagram indicator ('supply' is an adverb here, so in a 'supple' way).
'power'+'to'='powerto'
'powerto' with letters rearranged gives 'towrope'.
Can you help me to learn more?
(Other definitions for towrope that I've seen before include "Cable for hauling vehicle or vessel" , "Cable used after breakdowns" , "This may be used by a recovery vehicle" , "Pulling cable" , "AA might assist with this" .)