In a brave way, worker left sauce before end of gravy (9)

I believe the answer is:

gallantly

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

'left sauce before end of gravy' is the definition.
I can't tell whether this defines the answer.

'in a brave way worker' is the wordplay.
'in' means one lot of letters goes inside another.
'a brave' becomes 'gally' (I can't explain this - if you can you should give a lot more credence to this answer).
'way' becomes 'L' (abbreviation for left).
'worker' becomes 'ant' (worker is a type of ant).
'l'+'ant'='lant'
'gally' enclosing 'lant' is 'GALLANTLY'.

Can you help me to learn more?

I've seen this clue in The Daily Express.

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.