Crossword Genius

Heady reward for a tricky trio? (3)

Ross

I believe the answer is:

hat

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This could be a double definition.

'heady reward' is the first definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'tricky trio?' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'for a' is the link.

Can you help me to learn more?

(Other definitions for hat that I've seen before include "Eg, bowler" , "Cloche or fez?" , "Item of headgear" , "Headwear" , "Accessory" .)

I've seen this clue in the Evening Standard.
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