Two men reported Hazel (7)
I believe the answer is:
filbert
'hazel' is the definition.
(I know that filbert is a type of hazel)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for filbert that I've seen before include "Nut -- left rib (anag)" , "Hazel nut" , "Type of hazelnut" .)