Watcher who may appear unconscious? (7)

I believe the answer is:

lookout

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'watcher who' is the definition.
'lookout' can be an answer for 'watcher' (lookout is a kind of watcher). I'm not sure about the remainder of the definition.

'appear unconscious?' is the wordplay.
'appear' becomes 'look' (synonyms).
'unconscious?' becomes 'out' (similar in meaning).
'look'+'out'='LOOKOUT'

'may' is the link.

Can you help me to learn more?

(Other definitions for lookout that I've seen before include "Person keeping watch" , "Vantage point" , "One keeping watch" , "Nightwatchman" , "Beware - keep a sharp eye open" .)

I've seen this clue in the Evening Standard.

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