Flier that's not helping the Scottish Tourist Board (5)

I believe the answer is:

midge

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'flier' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for midge that I've seen before include "Two-winged fly" , "Small flying insect" , "Tiny swarming fly" , "Small person" , "Be an obstacle" .)

I've seen this clue in The Guardian.

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