Secretly observe a pony's performance? (3,2)

I believe the answer is:

spy on

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

'a pony's performance?' is the wordplay.
'performance?' indicates anagramming the letters (I've seen 'performance' mean this).
'ponys' with letters rearranged gives 'SPY ON'.

(Another definition for spy on that I've seen is " Secretly watch".)

I've seen this clue in the Evening Standard.

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