Perhaps all-in sabre dancing is their sphere (10)

I believe the answer is:

ballerinas

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'dancing is their sphere' is the definition.
I can't tell whether this defines the answer.

'perhaps all-in sabre' is the wordplay.
'perhaps' indicates anagramming the letters.
'all'+'in'+'sabre'='allinsabre'
'allinsabre' anagrammed gives 'BALLERINAS'.

Can you help me to learn more?

(Another definition for ballerinas that I've seen is " artistes".)

I've seen this clue in The Globe and Mail.

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