Old boy doomed to circle American cape hidden by fog? (10)

I believe the answer is:

obfuscated

I'm a little stuck... Click here to teach me more about this clue!

'hidden by fog?' is the definition.
'obfuscated' can be an answer for 'hidden' (thesaurus). I'm not sure about the 'by fog?' bit.

'old boy doomed to circle american cape' is the wordplay.
'old boy' becomes 'OB' (abbreviation for a private school 'old boy').
'doomed' becomes 'fated' ('fate' can be a synonym of 'doom').
'to circle' is an insertion indicator.
'american' becomes 'US' (United States).
'cape' becomes 'c' (abbreviation used on maps).
'us'+'c'='usc'
'fated' placed around 'usc' is 'fuscated'.
'ob'+'fuscated'='OBFUSCATED'

Can you help me to learn more?

(Another definition for obfuscated that I've seen is " Made unintelligible".)

I've seen this clue in The Everyman puzzle in The Observer.

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