Crossword Genius

Fire about ten main people finally, in addition (6)

Ross

I believe the answer is:

annexe

'addition' is the definition.
(annexe is a kind of addition)

'fire about ten main people finally' is the wordplay.
'fire' becomes 'axe' (I've seen this before**).
'about' is an insertion indicator.
'finally' suggests the final letters.
The last letters of 'ten main people' are 'nne'.
'axe' enclosing 'nne' is 'ANNEXE'.

'in' acts as a link.

(Other definitions for annexe that I've seen before include "Appropriate into one's territory" , "Extension, supplement" , "Additional building" , "Wing - extension" , "Building joined to another" .)

I've seen this clue in The Telegraph.
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