Reserved, laconic (8)
I believe the answer is:
taciturn
This clue is a double definition.
'reserved' is the first definition.
(I've seen this in another clue)
'laconic' is the second definition.
(I've seen this in another clue)
(Other definitions for taciturn that I've seen before include "Aloof" , "Untalkative" , "Quiet and uncommunicative" , "Disinclined towards conversation" , "Reserved, saying little" .)