Some macho MP in Gregg's eating noisily (8)

I believe the answer is:

chomping

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

'eating noisily' is the definition.
The answer and definition can be both related to consumption as well as being present participle verbs.
Maybe you can see an association between them that I don't see?

'some macho mp in gregg's' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'CHOMPING' is hidden in the letters of 'macho mp in gregg'.

Can you help me to learn more?

I've seen this clue in The Independent.

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.