Crossword Genius

Global organisation showing steely resolve might unsettle them (7)

Ross

I believe the answer is:

unnerve

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

'steely resolve might unsettle them' is the definition.
I can't tell whether this definition defines the answer.

'global organisation showing' is the wordplay.
'global organisation' becomes 'UN' (United Nations).
'showing' becomes 'nerve' (I can't justify this - if you can you should believe this answer much more).
'un'+'nerve'='UNNERVE'

Can you help me to learn more?

(Other definitions for unnerve that I've seen before include "Rattle" , "Frighten" , "Discourage - demoralise" , "To startle" , "Dishearten - discourage" .)

I've seen this clue in The Irish Times.
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