Hoskins is normal, Independent admitted ... my boss? Defective! (8)
I believe the answer is:
impaired
'defective' is the definition.
(I've seen this before)
'hoskins is normal independent admitted my boss?' is the wordplay.
'hoskins is' becomes 'I'm' (where the crossword setter is 'Hoskins').
'normal' becomes 'par' (as in par for the course).
'independent' becomes 'i'.
'admitted' is an insertion indicator (inserted letters are let in or admitted).
'my boss?' becomes 'ed' (abbreviation for editor, the setter's boss).
'par' going around 'i' is 'pair'.
'im'+'pair'+'ed'='IMPAIRED'
(Other definitions for impaired that I've seen before include "Made worse or less effective" , "Caused weakening, damaged" , "Spoiled" , "Damaged, marred" , "Damaged or weakened, maybe in health" .)