With which you might catch joke that bears fruit? (6)
I believe the answer is:
punnet
'with which you' is the definition.
I can't tell whether this definition defines the answer.
'catch joke that bears fruit?' is the wordplay.
I cannot quite see how this works, but
'catch' could be 'net' (net can mean to catch) and 'net' is present in the answer.
'joke' could be 'pun' (pun is a type of joke) and 'pun' is present in the answer.
No letters remain.
This explanation may well be incorrect...
'might' is the link.
Can you help me to learn more?
(Other definitions for punnet that I've seen before include "Shallow fruit basket" , "Small light basket for fruit" , "Small basket for 13 Across (6)" , "Strawberry etc. container" , "Little box (of strawberries?)" .)