French individual arriving to cover concert is inflexible (14)

I believe the answer is:

uncompromising

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

'inflexible' is the definition.
(synonyms)

'french individual arriving to cover concert is' is the wordplay.
'french individual' becomes 'un' (I can't justify this - if you can you should believe this answer much more).
'arriving' becomes 'coming' (coming is a kind of arriving).
'to cover' means one lot of letters goes inside another.
'concert' becomes 'prom' (abbreviation for promenade concert).
'prom'+'is'='promis'
'coming' placed around 'promis' is 'compromising'.
'un'+'compromising'='UNCOMPROMISING'

Can you help me to learn more?

(Other definitions for uncompromising that I've seen before include "firm" , "Not willing to make concessions" , "Obstinate" .)

I've seen this clue in The Daily Mail.

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.