Watch verbose criminal (7)
I believe the answer is:
observe
'watch' is the definition.
(I know that watch can be written as observe)
'verbose criminal' is the wordplay.
'criminal' indicates an anagram.
'verbose' anagrammed gives 'OBSERVE'.
(Other definitions for observe that I've seen before include "Verbose (anag.)" , "monitor" , "Spot, watch" , "Notice or make a remark" , "Scrutinise or comply with" .)