Indicator to motorists could be so daring! (4,4)
I believe the answer is:
road sign
'indicator to motorists' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'could be so daring' is the wordplay.
'could be' is an anagram indicator.
'so'+'daring'='sodaring'
'sodaring' with letters rearranged gives 'ROAD SIGN'.
Can you help me to learn more?
(Other definitions for road sign that I've seen before include "Stop or Yield, say" , "Perhaps stop" , "Bearer of warning" , "something that can be seen along the way" , "Notice for drivers" .)