Antipathy of detective as test develops (8)
I believe the answer is:
distaste
'antipathy' is the definition.
('distaste' can be a synonym of 'antipathy')
'detective as test develops' is the wordplay.
'detective' becomes 'di' (Detective Inspector abbreviation).
'develops' is an anagram indicator.
'as'+'test'='astest'
'astest' is an anagram of 'staste'.
'di'+'staste'='DISTASTE'
'of' is the link.
(Other definitions for distaste that I've seen before include "Negative feeling" , "mild revulsion" , "Mild dislike, aversion" , "Is stated (anag.)" , "Staidest (anag) - aversion (to)" .)