### Clue: Classmates, say, look intently at Greek press (4,5)
### Answer: PEER GROUP 
 ### Explanation: Definition: Classmates, say
  PEER(*look intently at*) and GR(*Greek* International Vehicle Registration letters) + OUP($$O$$xford $$U$$niversity *$$P$$ress*).  Defn:  An example,*say* of which are *classmates*.