Crossword Genius

Form of ciphers (7)

Ross

I believe the answer is:

spheric

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'form' is the definition.
The definition and answer are not the same part of speech.

'of ciphers' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'ciphers' anagrammed gives 'SPHERIC'.

Can you help me to learn more?

(Another definition for spheric that I've seen is " Round".)

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