The term 'clear the whiskers' is a phrase used to describe the act of shaving. The crossword solutions for this phrase are 'SHAVE' (5 letters), 'SHAVED' (6 letters), and 'sideburns' (9 letters). Shaving is the process of removing facial hair, such as a beard or mustache, using a razor or other sharp implement. Sideburns are the patches of hair that grow on either side of the face, just in front of the ears. To 'clear the whiskers' means to SHAVE off all of the facial hair, including the sideburns.