Man, a British isle (6)

I believe the answer is:

staffa

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'british isle' is the definition.
'staffa' can be an answer for 'isle' (I've seen this before). I am unsure of the 'british' bit.

'man a' is the wordplay.
'man' becomes 'staff' (both can mean to work at a particular post).
'staff'+'a'='STAFFA'

Can you help me to learn more?

(Other definitions for staffa that I've seen before include "Hebridean isle" , "Scottish island" , "Fingal's cave isle" , "small uninhabited island" , "northern isle" .)

I've seen this clue in The Times.

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