Time inside to practise yoga perhaps (7)

I believe the answer is:

stretch

I believe this clue is a double definition.

'time inside' is the first definition.
(stretch of time in prison)

'to practise yoga perhaps' is the second definition.
(yoga can involve stretching)

(Other definitions for stretch that I've seen before include "Straighten the arms" , "Term of imprisonment" , "Time inside" , "Exercise - period" , "Bit of exercise" .)

I've seen this clue in The Independent.

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