Pronouncement from investigators turning stomach (6)
I believe the answer is:
dictum
'pronouncement' is the definition.
('dictum' can be a synonym of 'pronouncement')
'investigators turning stomach' is the wordplay.
'investigators' becomes 'cid' (I've seen this in other clues).
'turning' shows that the letters should be reversed in order.
'stomach' becomes 'tum' ('tum' can be a synonym of 'stomach').
'cid' backwards is 'dic'.
'dic'+'tum'='DICTUM'
'from' is the link.
(Other definitions for dictum that I've seen before include "firm statement" , "Popular maxim" , "Authoritative statement" , "A Latin saying or formal expression of opinion" , "Short statement of a general principle" .)