Pressure (6)
'pressure' is the definition.
(I know that pressure can be written as coerce)
This is the entire clue.
(Other definitions for coerce that I've seen before include "Persuade (the unwilling) by force" , "Railroad" , "Forcibly compel" , "'Force, pressurise (6)'" , "Force into obedience" .)
(Other definitions for peer that I've seen before include "Equal -- look searchingly" , "Look hard through narrowed eyes" , "Person of equal standing" , "Noble; look with difficulty" , "Look; earl" .)