Sally's position in office (7)
I believe the answer is:
riposte
'sally's' is the definition.
(both can mean a witty remark)
'position in office' is the wordplay.
'position' becomes 'pos' (I've seen this in other clues).
'in' is an insertion indicator.
'office' becomes 'rite' (office can mean a religious ceremony or rite).
'pos' going within 'rite' is 'RIPOSTE'.
(Other definitions for riposte that I've seen before include "Smart reply" , "Quick clever reply" , "Quick and witty reply" , "Reply, retort" , "Snappy comeback" .)