Crossword Genius

While accompanying special forces, offend a killer (8)

Ross

I believe the answer is:

assassin

'a killer' is the definition.
(assassin is a kind of killer)

'while accompanying special forces offend' is the wordplay.
'while' becomes 'as' (eg 'while I walked' means 'as I walked').
'accompanying' means one lot of letters go next to another.
'special forces' becomes 'SAS' (Special Air Service).
'offend' becomes 'sin' (sin can mean to commit an offence).
'as'+'sas'+'sin'='ASSASSIN'

(Other definitions for assassin that I've seen before include "butcher" , "Carlos the Jackal was one" , "Terrorist" , "Hitman" , "One making hits" .)

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