Crossword Genius

Guard has to be careful (7)

Ross

I believe the answer is:

lookout

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'guard' is the definition.
(I know that lookout is a type of security guard)

'to be careful' is the wordplay.
'to be' becomes 'look' (looking is a kind of being).
'careful' becomes 'out' (I can't explain this - if you can you should give a lot more credence to this answer).
'look'+'out'='LOOKOUT'

'has' acts as a link.

Can you help me to learn more?

(Other definitions for lookout that I've seen before include "Person keeping watch" , "Guard on duty" , "One keeping watch" , "Observatory" , "Outlook for sentry" .)

I've seen this clue in The Sun.
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