Call, expressing disapproval, as half of them take private niche (9,5)

I believe the answer is:

telephone booth

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'half of them take private niche' is the definition.
I can't judge whether this definition defines the answer.

'call expressing disapproval' is the wordplay.
'call' becomes 'telephone' (synonyms).
'expressing disapproval' becomes 'booth' (I can't explain this - if you can you should believe this answer much more).
'telephone'+'booth'='TELEPHONE BOOTH'

'as' acts as a link.

Can you help me to learn more?

(Another definition for telephone booth that I've seen is " Call centre".)

I've seen this clue in The Irish Times.

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