An exposed position? (4)
I believe the answer is:
pose
'position?' is the definition.
(positioning is a kind of posing)
'an exposed' is the wordplay.
'POSE' is hidden within the letters.
However, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for pose that I've seen before include "Sit as model" , "Present (problem), sit" , "Model - ask (question)" , "Present (a question); sit" , "'Present, a problem say (4)'" .)