What any doe may become, eventually

I think it could be either:

Which length description are you looking for?:

3,3

one day

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

'eventually' is the definition.
(I've seen this before)

'what any doe may' is the wordplay.
'any doe' anagrams to 'ONE-DAY'.
But, I'm not clear how the anagram is indicated.

'become' acts as a link.

Can you help me to learn more?

(Other definitions for one day that I've seen before include "sometime" , "In time to come" , "#Eventually" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.