Way a little sibling defines stagnation (6)

I believe the answer is:

stasis

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'stagnation' is the definition.
(I've seen this before)

'way a little sibling' is the wordplay.
'way' becomes 'st' (abbreviation for street).
'little sibling' becomes 'sis' (short for sister).
'st'+'a'+'sis'='STASIS'

'defines' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.

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(Other definitions for stasis that I've seen before include "Assist with stagnant condition" , "Condition of arrested progress" , "Inactive state" , "Period of inactivity" , "Stoppage of blood circulation" .)

I've seen this clue in The Times.

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