Crossword Genius

Extensive exercise done by prisoners (7)

Ross

I believe the answer is:

stretch

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'exercise done by prisoners' is the definition.
'stretch' can be an answer for 'exercise' (stretching is a kind of exercising). I am not sure about the 'done by prisoners' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stretch that I've seen before include "Bit of exercise" , "time at Pentonville?" , "Prison sentence (colloquial)" , "Extend, time spent in prison" , "sort of limousine" .)

I've seen this clue in The Globe and Mail and The Irish News.
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