Crossword Genius

One MP’s interfering, so I’m off (7,8)

Ross

I believe the answer is:

foreign minister

'one mp's' is the definition.

'interfering so i'm off' is the wordplay.
'off' is an anagram indicator.
'interfering'+'so'+'im'='interferingsoim'
'interferingsoim' anagrammed gives 'FOREIGN MINISTER'.

(Other definitions for foreign minister that I've seen before include "Angela Merkel, for instance" , "Straw was" , "Powerful person in government" , "churchman from Rome?" , "Senior politician" .)

I've seen this clue in The Sunday Times.
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