Home groups are part of something bigger (6)

I believe the answer is:

insets

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'part of something bigger' is the definition.
I can't judge whether this definition defines the answer.

'home groups' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'groups' becomes 'sets' (a set is a group of things).
'in'+'sets'='INSETS'

'are' acts as a link.

Can you help me to learn more?

(Another definition for insets that I've seen is " additions to magazines".)

I've seen this clue in The Irish Times.

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