Crossword Genius

Unruly adolescent initially involved with same group (10)

Ross

I believe the answer is:

rampageous

'unruly' is the definition.
(I've seen this in another clue)

'adolescent initially involved with same group' is the wordplay.
'initially' suggests taking the first letters.
'involved with' indicates an anagram (involved can mean confusing or complex).
The initial letter of 'adolescent' is 'a'.
'same'+'group'='samegroup'
'a' anagrammed with 'samegroup' makes 'RAMPAGEOUS'.

(Another definition for rampageous that I've seen is " displaying violent behaviour?".)

I've seen this clue in The Times.
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