The man on watch? (6)

I believe the answer is:

albert

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This could be a double definition.

'the man' is the first definition.

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

'on' is the link.

Can you help me to learn more?

(Other definitions for albert that I've seen before include "Prince of Monaco" , "Victim of lion" , "Short kind of watch-chain" , "German prince" , "Kind of watch chain" .)

I've seen this clue in The Globe and Mail.

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