Was in form when phased out (6)

I believe the answer is:

shaped

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'was in form' is the definition.
I can't tell whether this definition defines the answer.

'phased out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'phased' anagrammed gives 'SHAPED'.

'when' is the link.

Can you help me to learn more?

(Other definitions for shaped that I've seen before include "Cast or moulded" , "Sculpted" , "Gave form to" , "Moulded, wrought" , "modelled" .)

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

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