Rental contracts showing great detail (5)

I believe the answer is:

hires

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'rental contracts' is the definition.
'hires' can be an answer for 'contracts' (I've seen this in another clue). I am unsure of the 'rental' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for hires that I've seen before include "Employs or rents" , "Charters" .)

I've seen this clue in The Independent.

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