Be tall suitably for dancing (6)

I believe the answer is:

ballet

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'dancing' is the definition.
(ballet is a kind of dancing)

I don't understand the remainder of the clue.

(Other definitions for ballet that I've seen before include "Dance entertainment" , "kind of skirt" , "Dance art form" , "Nureyev's forte" , "Let lab open up for dance" .)

I've seen this clue in the Evening Standard.

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