Form obtained out of phase (5)

I believe the answer is:

shape

I'm a little stuck... Click here to teach me more about this clue!

'form' is the definition.
(I know that form can be written as shape)

'obtained out of phase' is the wordplay.
'phase' can be anagrammed to 'SHAPE'.
Though, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for shape that I've seen before include "Phase (anag.)" , "Square, circle, etc." , "External form" , "Heaps (anag.)" , "Form; mould" .)

I've seen this clue in the Sydney Morning Herald.

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