Dance, say - for every shape, a trance developed (11,3)

I believe the answer is:

performance art

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'dance say' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'every shape a trance developed' is the wordplay.
'every' becomes 'per' ('per' means 'for each' or 'for every').
'shape' becomes 'form' (synonyms).
'developed' is an anagram indicator.
'trance' anagrammed gives 'nceart'.
'per'+'form'+'a'+'nceart'='PERFORMANCE ART'

'for' acts as a link.

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I've seen this clue in The Daily Express.

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