Accept it, as True Detectives opens with suspect (10)
I believe the answer is:
disbelieve
'suspect' is the definition.
(thesaurus)
'accept it as true detectives opens' is the wordplay.
I cannot really see how this works, but
'accept' could be 'believe' (believing is a kind of accepting) and 'believe' is found within the answer.
'detectives' could be 'dis' (Detective Inspectors, DIs) and 'dis' is found within the answer.
No letters remain.
This may be the basis of clue (or it may be nonsense).
'with' acts as a link.
Can you help me to learn more?
(Other definitions for disbelieve that I've seen before include "Have no faith (in)" , "Mistrust" .)