One Goth perhaps extremely busy (2,3,2)

I believe the answer is:

on the go

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'extremely busy' is the definition.
'on the go' can be an answer for 'busy' (similar in meaning). I'm unsure of the 'extremely' bit.

'one goth perhaps' is the wordplay.
'perhaps' is an anagram indicator.
'one'+'goth'='onegoth'
'onegoth' anagrammed gives 'ON THE GO'.

Can you help me to learn more?

(Other definitions for on the go that I've seen before include "Very busy, in constant motion" , "Always busy" , "ready to start monopoly?" , "Active and energetic" , "Busy and active" .)

I've seen this clue in The Sun.

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