In which suspect is to linger? (10)

I believe the answer is:

loiterings

I'm a little stuck... Click here to teach me more about this clue!

'in' is the definition.
I know nothing about this answer so I can't judge whether this works.

'suspect is to linger?' is the wordplay.
'suspect' indicates an anagram.
'is'+'to'+'linger'='istolinger'
'istolinger' is an anagram of 'LOITERINGS'.

'which' is the link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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