Poet regularly longs for fruit (7)
I believe the answer is:
peaches
'fruit' is the definition.
(I've seen this before)
'poet regularly longs' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'longs' becomes 'aches' ('ache' can be a synonym of 'long').
The alternating letters of 'poet' are 'pe'.
'pe'+'aches'='PEACHES'
'for' acts as a link.
(Other definitions for peaches that I've seen before include "A speech (anag)" , "Juicy fruits" , "Make a speech about the fruit" , "Producing fine specimens" .)