Ye Olde Bull sticks with house wine ultimately (7)

I believe the answer is:

gumshoe

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'wine ultimately' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gumshoe that I've seen before include "footwear" , "Possible US version of Morse" , "Dick" , "Detective (US colloq.)" , "American detective (informal)" .)

I've seen this clue in The Sunday Times and The Times.

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