Assist flow when blood flow is restricted (6)

I believe the answer is:

stasis

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'blood flow is restricted' is the definition.
I can't tell whether this defines the answer.

'assist flow' is the wordplay.
'flow' indicates an anagram (to flow can mean to move around).
'assist' is an anagram of 'STASIS'.

'when' is the link.

Can you help me to learn more?

(Other definitions for stasis that I've seen before include "Assist (anag.)" , "Enduring state" , "Cessation" , "Condition of arrested progress" , "Assist with stagnant condition" .)

I've seen this clue in The Hindu.

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