Networking service popular with males (9)
I believe the answer is:
'networking service' is the definition.
(social network)
'popular with males' is the wordplay.
I cannot quite see how this works, but
'popular' could be 'in' ('in' can mean trendy) and 'in' is found in the answer.
This explanation may well be incorrect...
I've seen this clue in The Independent.
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