Develop need to indicate (6)
I believe the answer is:
denote
'indicate' is the definition.
(I've seen this in another clue)
'develop need to' is the wordplay.
'develop' indicates an anagram.
'need'+'to'='needto'
'needto' anagrammed gives 'DENOTE'.
(Other definitions for denote that I've seen before include "Designate" , "Indicate, signify" , "Mean or signify" , "Stand as symbol for" , "Point" .)