A crazy effort involving country -- America (7)

I believe the answer is:

dingbat

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This clue might be a double definition.

'a crazy effort' is the first definition.
The definition suggests a singular noun which matches the answer.

'country america' is the second definition.
The definition suggests a singular noun which matches the answer.

'involving' acts as a link.

Can you help me to learn more?

(Other definitions for dingbat that I've seen before include "Thingummy - bind tag (anag)" , "11 [LOLLY]" , "Idiot" , "Aussie fool" , "Silly billy - it'd bang (anag)" .)

I've seen this clue in The Telegraph.

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