Crossword Genius

Circulatory issue limits old husband stretching too much (14)

Ross

I believe the answer is:

hyperextension

I'm a little stuck... Click here to teach me more about this clue!

'circulatory issue' is the definition.
The definition suggests a singular noun which matches the answer.

'limits old husband stretching too much' is the wordplay.
I cannot really understand how this works, but
'old' could be 'ex' (prefix meaning former or onetime) and 'ex' is present in the answer.
'husband' could be 'h' and 'h' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Sunday Times and The Times.
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