Harvest orchard fruit that’s to be seen again (8)
I believe the answer is:
reappear
'to be seen again' is the definition.
(I've seen this before)
'harvest orchard fruit' is the wordplay.
'harvest' becomes 'reap' ('reap' can be a synonym of 'harvest').
'orchard fruit' becomes 'pear' (I've seen this before).
'reap'+'pear'='REAPPEAR'
'that's' acts as a link.
(Other definitions for reappear that I've seen before include "Come into view again" , "spring up again?" , "crop up again" , "make a comeback" , "Show over" .)