International honour can go to one's head! (3)

I believe the answer is:

cap

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'international' is the definition.
(sportsperson who competes internationally)

I cannot understand how the rest of the clue works.

(Other definitions for cap that I've seen before include "Dental work" , "Protective lid" , "Soft hat; crown" , "Soft hat; lid" , "Headdress" .)

I've seen this clue in the Evening Standard.

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