New interpretation nation rejected, though it's supposedly more appealing (8)

I believe the answer is:

prettier

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'it's supposedly more appealing' is the definition.
I can't judge whether this definition defines the answer.

'new interpretation nation rejected' is the wordplay.
'new' is an anagram indicator.
'rejected' indicates named letters should be taken away.
'interpretation' with 'nation' removed is 'erpretti'.
'erpretti' is an anagram of 'PRETTIER'.

'though' is the link.

Can you help me to learn more?

(Other definitions for prettier that I've seen before include "More beautiful" , "More lovely" , "More attractive in a delicate way" .)

I've seen this clue in The Irish Times.

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