Cryptic clue with Brutus in alternative group (10)

I believe the answer is:

subculture

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

'alternative group' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Maybe there's a link between them I don't understand?

'cryptic clue with brutus' is the wordplay.
'cryptic' indicates anagramming the letters (a cryptic or obscure order of the letters).
'with' says to put letters next to each other.
'clue' after 'brutus' is 'brutusclue'.
'brutusclue' is an anagram of 'SUBCULTURE'.

'in' acts as a link.

Can you help me to learn more?

(Another definition for subculture that I've seen is " Group with distinct behaviour within a larger one".)

I've seen this clue in The Independent.

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