John pinching Nick's lines in chat room (8)

I believe the answer is:

locutory

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'chat room' is the definition.
The definition suggests a singular noun which matches the answer.

'john pinching nick's lines' is the wordplay.
'john' becomes 'loo' (both can mean a toilet).
'pinching' indicates putting letters inside (taking inside).
'nick' becomes 'cut'.
'lines' becomes 'ry' (abbreviation for railway).
'loo' going around 'cut' is 'locuto'.
'locuto'+'ry'='LOCUTORY'

'in' acts as a link.

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I've seen this clue in The Guardian.

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