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Not impressed by turns, A.N. Other opened shows on tour (8)

Ross

I believe the answer is:

undinted

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

'turns a n other opened shows on tour' is the definition.
I can't tell whether this definition defines the answer.

'not impressed by' is the wordplay.
'not' becomes 'un' (I've seen this in other clues).
'impressed' becomes 'dinted' (I can't explain this - if you can you should believe this answer much more).
'by' means one lot of letters go next to another.
'un'+'dinted'='UNDINTED'

Can you help me to learn more?

I've seen this clue in The Telegraph.
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