Prettiness in a constantly recurring form (10)

I believe the answer is:

persistent

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

'recurring form' is the definition.
'persistent' can be an answer for 'recurring' (thesaurus). I'm unsure of the 'form' bit.

'prettiness in a constantly' is the wordplay.
'prettiness' can be anagrammed to 'PERSISTENT'.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for persistent that I've seen before include "single-minded" , "Pressing" , "Prolonged; nagging" , "Endless" , "Tenacious; constant" .)

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

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