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Quashes issue from a previous relationship? (7)

Ross

I believe the answer is:

stepson

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'a previous relationship?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'quashes issue' is the wordplay.
'quashes' becomes 'step' (I can't explain this - if you can you should give a lot more credence to this answer).
'issue' becomes 'son' (issue can mean someone's offspring).
'step'+'son'='STEPSON'

'from' is the link.

Can you help me to learn more?

(Other definitions for stepson that I've seen before include "Child from a spouse's former marriage" , "underfoot?" , "No pests for male issue of spouse - but not of self" , "No pests (anag)" , "Tramples (5,2) -- relative" .)

I've seen this clue in The Times.
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