Standard part of flying is negotiating to get upgraded (6)

I believe the answer is:

ensign

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

'standard' is the definition.
(both can mean a flag)

'flying is negotiating to get upgraded' is the wordplay.
'ENSIGN' is hidden back-to-front in amongst the letters.
However, I'm not sure how the hidden word is indicated.

'part of' is the link.

Can you help me to learn more?

(Other definitions for ensign that I've seen before include "SECOND PART OF 10" , "that's flown" , "US naval rank" , "Military or naval flag" , "Soldier who carries the Colours" .)

I've seen this clue in The Irish Times.

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.