Oscar gets marmoset, bizarrely, for those living with him (9)

I believe the answer is:

roommates

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'those living with him' is the definition.
The definition suggests a singular noun but the answer is a plural noun.

'oscar gets marmoset bizarrely' is the wordplay.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'gets' means one lot of letters goes inside another.
'bizarrely' indicates an anagram.
'marmoset' anagrammed gives 'rommates'.
'o' placed within 'rommates' is 'ROOMMATES'.

'for' is the link.

Can you help me to learn more?

(Other definitions for roommates that I've seen before include "Associates" , "Fellow lodgers" .)

I've seen this clue in The Irish Times.

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