Heavy weight of fruit picked up (5)
I believe the answer is:
plumb
'heavy weight' is the definition.
'plumb' can be an answer for 'weight' (plumbing is a kind of weighting). I'm not certain of the 'heavy' bit.
'fruit picked up' is the wordplay.
'fruit' becomes 'plum' (plum is a kind of fruit).
'picked up' shows a homophone (sound like).
'plum' is a homophone of 'PLUMB'.
'of' is the link.
Can you help me to learn more?
(Other definitions for plumb that I've seen before include "Lead weight for measuring depth" , "Exactly - . . . . . in the middle" , "For Americans, quite" , "Vertical; measure (depth)" , "Get to the bottom of the matter or depths" .)