PC setter or otherwise looking back (10)
I believe the answer is:
retrospect
'looking back' is the definition.
(I've seen this before)
'pc setter or otherwise' is the wordplay.
'otherwise' indicates anagramming the letters.
'pc'+'setter'+'or'='pcsetteror'
'pcsetteror' is an anagram of 'RETROSPECT'.
(Other definitions for retrospect that I've seen before include "A backward view" , "Hindsight" , "Survey of past events" , "review" , "Look(ing) back" .)