Get high on your own smart performance (3,4)

I believe the answer is:

fly solo

'get high on your own' is the definition.
(as in flying up high on your own)

'smart performance' is the wordplay.
'smart' becomes 'fly' (fly can informally mean smart or well-dressed).
'performance' becomes 'solo'.
'fly'+'solo'='FLY SOLO'

I've seen this clue in The Guardian.

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