Fruit reported — heavy hanging masses (6)
I believe the answer is:
plumbs
'heavy hanging masses' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot see how they can define each other.
'fruit reported' is the wordplay.
'fruit' becomes 'plum' (plum is a kind of fruit).
'reported' becomes 'bs' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'plum'+'bs'='PLUMBS'
Can you help me to learn more?
(Other definitions for plumbs that I've seen before include "Gets to the bottom of" , "Sounds" , "Reaches or experiences, say the depths" .)