Crossword Genius

Mike wearing collar where members can relax (7)

Ross

I believe the answer is:

armrest

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'where members can relax' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'mike wearing collar' is the wordplay.
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'wearing' means one lot of letters goes inside another.
'collar' becomes 'arrest' (synonyms).
'm' placed inside 'arrest' is 'ARMREST'.

Can you help me to learn more?

(Other definitions for armrest that I've seen before include "giving a member support" , "Side part of chair" , "Part of a chair - smarter (anag)" , "Support for one member" , "Padded side to a chair" .)

I've seen this clue in The Telegraph.
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