PA, on reflection sharp, given a job (9)
I believe the answer is:
appointed
'given a job' is the definition.
(I've seen this before)
'pa on reflection sharp' is the wordplay.
'on reflection' is a reversal indicator.
'sharp' becomes 'pointed' (similar in meaning).
'pa' back-to-front is 'ap'.
'ap'+'pointed'='APPOINTED'
(Other definitions for appointed that I've seen before include "Taken on" , "Assigned to a role" , "Designated" , "Given the situation" , "provided, with a job" .)