Good way to defend a porter (7)

I believe the answer is:

stoutly

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

'good' is the definition.
Both the definition and answer are adverbs. Maybe you can see an association between them that I don't see?

'way to defend a porter' is the wordplay.
I cannot really see how this works, but
'way' could be 'st' (abbreviation for street) and 'st' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for stoutly that I've seen is " Bravely".)

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.