Crossword Genius

Leads in school play present Oberon, for example (6)

Ross

I believe the answer is:

sphere

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'oberon for example' is the definition.
I can't tell whether this defines the answer.

'leads in school play present' is the wordplay.
'leads in' indicates taking the first letters (I've seen 'lead in' mean this).
'present' becomes 'here' (both can mean in attendance).
The first letters of 'school play' is 'sp'.
'sp'+'here'='SPHERE'

Can you help me to learn more?

(Other definitions for sphere that I've seen before include "Round shape" , "Round object" , "Perfect round" , "Vault of heaven" , "Ball, orb" .)

I've seen this clue in The Independent.
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