Pluck neck or cheek (5)
I believe the answer is:
nerve
This clue is a triple definition!
'pluck' is the first definition.
(I've seen this in another clue)
'neck' is the second definition.
(both can mean attitude or insolence)
'or' is a link.
'cheek' is the third definition.
(I know that cheek can be written as nerve)
(Other definitions for nerve that I've seen before include "Confidence" , "Boldness" , "Cool courage" , "Spunk" , "Cord that carries instructions from brain to body" .)