Disease in fruit recurring we hear (4-4)
I believe the answer is:
beri-beri
'disease in fruit' is the definition.
'beri beri' can be an answer for 'disease' (I've seen this before). I'm unsure of the 'in fruit' bit.
'recurring we hear' is the wordplay.
'recurring' says to double the letters (the letters occur more than once).
'we hear' becomes 'beri' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'beri' duplicated is 'BERI-BERI'.
Can you help me to learn more?
(Another definition for beri-beri that I've seen is " tropical disease".)