Family symbol (5)
I believe the answer is:
crest
'family symbol' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for crest that I've seen before include "Top point of hill or wave" , "Top line of a hill, mountain, or wave" , "Highest point" , "Summit - emblem - cockscomb" , "Peak - comb" .)