Is the fellow sure it is carrying too much? (7)

I believe the answer is:

surfeit

I'm a little stuck... Click here to teach me more about this clue!

'too much?' is the definition.

'is the fellow sure it is carrying' is the wordplay.
'is the fellow' becomes 'f' (I can't explain this - if you can you should believe this answer much more).
'is carrying' is an insertion indicator.
'sure'+'it'='sureit'
'f' inserted inside 'sureit' is 'SURFEIT'.

Can you help me to learn more?

(Other definitions for surfeit that I've seen before include "Superabundance" , "Overindulge" , "it's more than one needs" , "stuff, once" , "Overindulgence" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.