Make a comment thats unusually verbose (7)
I believe the answer is:
observe
'make a comment' is the definition.
(make an observation)
'unusually verbose' is the wordplay.
'unusually' is an anagram indicator.
'verbose' anagrammed gives 'OBSERVE'.
'thats' is the link.
(Other definitions for observe that I've seen before include "Keep; notice" , "taking notice" , "Obverse (anag.)" , "Discern" , "Watch closely" .)