It's possibly nice to see (6)
I believe the answer is:
notice
'see' is the definition.
(notice can mean to see or realise)
'it's possibly nice to' is the wordplay.
'it's possibly' indicates an anagram.
'nice'+'to'='niceto'
'niceto' with letters rearranged gives 'NOTICE'.
(Other definitions for notice that I've seen before include "Observe the placard or sign" , "Advance information" , "Review - poster" , "Announcement or warning" , "Observe; advertisement" .)