Inner veins displayed cheek (5)
I believe the answer is:
nerve
'cheek' is the definition.
(I know that cheek can be written as nerve)
'inner veins displayed' is the wordplay.
'displayed' indicates the answer is hidden within the clue (the answer is displayed within the clue).
'NERVE' can be found hidden inside 'inner veins'.
(Other definitions for nerve that I've seen before include "Sauce" , "Courage, coolness in danger" , "Spunk" , "Cheek; self-possession" , "Sensory organ; bottle" .)