Unusually verbose remark (7)
I believe the answer is:
observe
'remark' is the definition.
(I've seen this before)
'unusually verbose' is the wordplay.
'unusually' indicates an anagram.
'verbose' is an anagram of 'OBSERVE'.
(Other definitions for observe that I've seen before include "Scrutinise or comply with" , "Notice or conform to, rules say" , "Watch carefully" , "What this newspaper does?" , "Witness, watch" .)