Not too late for "One Fine Day” (2,4)
I believe the answer is:
in time
'not too late' is the definition.
(I've seen this before)
'one fine day' is the wordplay.
I cannot really understand how this works, but
'one' could be 'me' (a setter might use 'one' to humourously mean 'me') and 'me' is located in the answer.
The remaining letters 'inti' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for in time that I've seen before include "What musicians aim to be" , "Early enough" , "on schedule" , "Later perhaps" , "not too late" .)