Indicate or designate (6)
I believe the answer is:
denote
I believe this clue is a double definition.
'indicate' is the first definition.
(I've seen this in another clue)
'designate' is the second definition.
(I know this)
(Other definitions for denote that I've seen before include "Designate" , "Mean or signify" , "Indicate, be a sign of" , "Need to (anag) - indicate" , "Be the sign or symbol of" .)