Scoffing can be worrying (6)
I believe the answer is:
eating
'worrying' is the definition.
(eating is a kind of worrying)
'scoffing can' is the wordplay.
I cannot quite see how this works, but
'can' could be 'tin' ('tin' can be a synonym of 'can') and 'tin' is found within the answer.
This may be the basis of clue (or it may be nonsense).
'be' is the link.
Can you help me to learn more?
(Other definitions for eating that I've seen before include "Consuming food" , "Having supper?" , "Ingestion" , "Putting away" , "Taking in solid food" .)