Do yoga street gag (7)

I believe the answer is:

stretch

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'do yoga' is the definition.
'stretch' can be an answer for 'yoga' (thesaurus). I'm not certain of the 'do' bit.

'street gag' is the wordplay.
'street' becomes 'st' (abbreviation).
'gag' becomes 'retch' (I've seen this in other clues).
'st'+'retch'='STRETCH'

Can you help me to learn more?

(Other definitions for stretch that I've seen before include "Prison sentence (colloquial)" , "that one may do to a point" , "Make demands on; continuous expanse" , "Make to go further" , "having just woken up?" .)

I've seen this clue in the Sydney Morning Herald.

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