Chap touring Guernsey? (3)

I believe the answer is:

guy

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This clue could be a double definition.

'chap' is the first definition.

'touring guernsey?' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

Can you help me to learn more?

(Other definitions for guy that I've seen before include "Steadying rope" , "Male" , "Stay < and make fun" , "Fellow; securing rope" , "Man; effigy" .)

I've seen this clue in the Evening Standard.

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