Conceited, like the girl in the advertising poster (5-2)
I believe the answer is:
stuck-up
'conceited' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for stuck-up that I've seen before include "Hoity-toity" , "Overly conceited or arrogant" , "Snooty" , "Snobbish, proud" , "Toffee-nosed" .)