Blade on another razor, initially (3)
I believe the answer is:
oar
'blade' is the definition.
(blade is the word for oar in competitive rowing)
'on another razor initially' is the wordplay.
'initially' indicates taking the first letters.
The first letters of 'on another razor' is 'OAR'.
(Other definitions for oar that I've seen before include "Rowing blade" , "spoon?" , "Rower's flat blade" , "Bladed pole" , "Propelling blade" .)