Crossword Genius

Delia's perfect form (5)

Ross

I believe the answer is:

ideal

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

'perfect form' is the definition.
'ideal' can be an answer for 'perfect' (I've seen this in another clue). I am unsure of the 'form' bit.

'delia's' is the wordplay.
'delia' anagrams to 'IDEAL'.
But, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for ideal that I've seen before include "just the job" , "Most suitable" , "Perfect but not likely to become a reality" , "(the best one can get)" , "without a flaw" .)

I've seen this clue in The Irish Independent, The Globe and Mail and The Irish News.
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