A juicy lump, perhaps (4)
I believe the answer is:
plum
'a juicy' is the definition.
I can't tell whether this definition defines the answer.
'lump perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'lump' is an anagram of 'PLUM'.
Can you help me to learn more?
(Other definitions for plum that I've seen before include "Fruit tree - of especial value?" , "Damson-like fruit" , "excellent?" , "Best; fruit" , "Select" .)