Start to eat into fresh fruits in abundance (7)
I believe the answer is:
surfeit
'abundance' is the definition.
(surfeit is a kind of abundance)
'start to eat into fresh fruits' is the wordplay.
'start to' says to take the initial letters.
'into' means one lot of letters goes inside another.
'fresh' indicates an anagram.
The first letter of 'eat' is 'e'.
'fruits' is an anagram of 'surfit'.
'e' inserted within 'surfit' is 'SURFEIT'.
'in' is the link.
(Other definitions for surfeit that I've seen before include "Excess, glut" , "Overindulgence" , "Fustier (anag)" , "it's more than one needs" , "Overindulge" .)