Aug, Sept, clearly steal the show (7)

I believe the answer is:

upstage

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'steal the show' is the definition.
(I've seen this before)

'aug sept clearly' is the wordplay.
'aug sept' can be anagrammed to 'UPSTAGE'.
However, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for upstage that I've seen before include "Stand-offish (sl.)" , "Direct attention away from someone on to oneself" , "Take attention from (another actor)" , "Better" , "Outdo" .)

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

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