A fruit of the lemon variety (5)
I believe the answer is:
melon
'a fruit' is the definition.
(type of fruit)
'lemon variety' is the wordplay.
'variety' indicates an anagram.
'lemon' is an anagram of 'MELON'.
'of the' acts as a link.
(Other definitions for melon that I've seen before include "I'm very seedy" , "Large round fruit" , "Edible gourd" , "Killing" , "Fruit of the gourd family with a hard rind and juicy flesh" .)