Crossword Genius

Most anxious European saved by a nap in Spain, mostly (9)

Ross

I believe the answer is:

uneasiest

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

'most anxious' is the definition.
(I've seen this before)

'european saved by a nap in spain mostly' is the wordplay.
I cannot quite understand how this works, but
'european' could be 'e' (abbreviation e.g. EU) and 'e' is located in the answer.
'a' is present in the answer.
'spain' could be 'es' (es is an abbreviation for Spain) and 'es' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for uneasiest that I've seen before include "Most anxious" , "very hard?" , "extremely nervous" , "Most like a crowned head" .)

I've seen this clue in The Times.
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