From the outset, no chicken will mix with this interloper. (6,2,3,4)

I believe the answer is:

cuckoo in the nest

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

'mix with this interloper' is the definition.
The answer and definition are not the same part of speech.

'from the outset no chicken' is the wordplay.
'from' is an anagram indicator (the anagram comes from the same letters).
'outset'+'no'+'chicken'='outsetnochicken'
'outsetnochicken' anagrammed gives 'CUCKOO IN THE NEST'.

'will' acts as a link.

Can you help me to learn more?

(Another definition for cuckoo in the nest that I've seen is " Unwelcome intruder".)

I've seen this clue in The Irish Times.

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