Reveal advice on how to be less reserved? (4,2)
I believe the answer is:
open up
'reveal' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for open up that I've seen before include "Begin firing; disclose" , "Unlock building or reveal inner thoughts" , "Talk more freely" , "become less cloistered" , "Begin shooting; become more confiding" .)