Unlawfully taking time to instigate group (10)

I believe the answer is:

trousering

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'unlawfully taking time' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'instigate group' is the wordplay.
'instigate' becomes 'trouse' (I am not sure about this - if you are sure you should believe this answer much more).
'group' becomes 'ring'.
'trouse'+'ring'='TROUSERING'

'to' is the link.

Can you help me to learn more?

I've seen this clue in The Hindu.

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