No particular date for transforming an amenity (7)

I believe the answer is:

anytime

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

'no particular date for transforming an amenity' is the definition.
I can't tell whether this defines the answer.

'transforming an amenity' is the wordplay.
'transforming' indicates an anagram (I've seen this in other clues).
'amenity' with letters rearranged gives 'ANYTIME'.

Can you help me to learn more?

(Other definitions for anytime that I've seen before include "Whenever, as it doesn't matter" , "At no particular moment" , "A tiny me (anag.)" , "At whatever moment" , "date not fixed" .)

I've seen this clue in The Irish Independent.

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