Popular fellow, unhappy with people arriving (6)

I believe the answer is:

inflow

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'people arriving' is the definition.
I can't judge whether this definition defines the answer.

'popular fellow unhappy' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'fellow' becomes 'F' (abbreviation - of a society etc.).
'unhappy' becomes 'low'.
'in'+'f'+'low'='INFLOW'

'with' is the link.

Can you help me to learn more?

(Other definitions for inflow that I've seen before include "Arrival of air or water" , "Movement towards the centre" , "Movement inwards" , "Rate of arrival" , "Island of Tanzania" .)

I've seen this clue in The Irish Times.

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