Round book printed on dedicated computer paper (8)
I believe the answer is:
observer
'paper' is the definition.
(I've seen this before)
'round book printed on dedicated computer' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'book' becomes 'b'.
'printed on' means one lot of letters go next to another (in a down clue, some letters go on top of others).
'dedicated computer' becomes 'server' (computer performing a particular service).
'o'+'b'+'server'='OBSERVER'
(Other definitions for observer that I've seen before include "One watching, evaluating" , "monitor" , "Sunday newspaper" , "I notice" , "Newspaper - witness" .)