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A horse perhaps, or turn into Sesame Street character (5)

Ross

I believe the answer is:

aggro

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'turn into sesame street character' is the definition.
I can't tell whether this definition defines the answer.

'a horse perhaps or' is the wordplay.
'horse' becomes 'gg' (geegee or GG is a childish term for a horse).
'perhaps' indicates an anagram.
'or' anagrammed gives 'ro'.
'a'+'gg'+'ro'='AGGRO'

Can you help me to learn more?

(Other definitions for aggro that I've seen before include "In slang, hassle or troublemaking" , "Problems and difficulties" , "Violence - difficulties" , "Hostile troublemaking" , "Difficulties, trouble" .)

I've seen this clue in the Sydney Morning Herald.
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