Cut back on fruit, on the day (6)
I believe the answer is:
pruned
'cut back on' is the definition.
(I've seen this in another clue)
'fruit on the day' is the wordplay.
I cannot really see how this works, but
'fruit' could be 'prune' (prune is a kind of fruit) and 'prune' is found within the answer.
'day' could be 'd' (abbreviation for day) and 'd' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for pruned that I've seen before include "Cut away overgrown branches" , "what one did making Bush appear smart?" , "Trimmed shrubs etc to promote growth" , "Trimmed branches etc to promote growth" , "reduced to a minimum?" .)