Fruitful appointment? (4)
I believe the answer is:
date
'appointment?' is the definition.
('date' can be a synonym of 'appointment')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for date that I've seen before include "Particular time when event happened" , "For example, sell by" , "Romantic assignation" , "Romantic appointment" , "Go out with" .)