Extremely lofty senior officer's a bit off (9)

I believe the answer is:

superhigh

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'senior officer's a bit off' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'extremely lofty' is the wordplay.
'extremely' becomes 'super' (synonyms).
'lofty' becomes 'high' (similar in meaning).
'super'+'high'='SUPERHIGH'

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I've seen this clue in The Independent.

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