Detective's sidekick has hour to find TV guide? (6)

I believe the answer is:

watson

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'guide?' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for watson that I've seen before include "Sherlock Holmes's doctor ally" , "Companion to 15 ac" , "Holmes's assistant" , "Crick's fellow geneticist" , "Baker Street doctor" .)

I've seen this clue in The Irish Times.

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