Some may catch one tampering with fruit tree (6)
I believe the answer is:
medlar
'fruit tree' is the definition.
(medlar is a kind of fruit tree)
'some may catch one tampering' is the wordplay.
'some' means to look at the middle letters.
'catch' means one lot of letters goes inside another.
'one' becomes 'me' (a setter might use 'one' to humourously mean 'me').
'tampering' becomes 'dlr' (I can't justify this - if you can you should give a lot more credence to this answer).
The central letter of 'may' is 'a'.
'me'+'dlr'='medlr'
'a' put within 'medlr' is 'MEDLAR'.
'with' acts as a link.
Can you help me to learn more?
(Other definitions for medlar that I've seen before include "Led ram (anag) - fruit related to the apple" , "Red Mal turns to the fruit tree" , "Dermal (anag.)" , "Apple-like fruit" .)
