Cockney's wife trouble? (6)

I believe the answer is:

strife

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This might be a double definition.

'cockney's wife' is the first definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'trouble?' is the second definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for strife that I've seen before include "Heated discord" , "Discord and friction" , "'Discord, conflict (6)'" , "Warfare" , "Trouble, hassle" .)

I've seen this clue in the Evening Standard.

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