Up north, a sign of what's conceited? (4)
I believe the answer is:
vain
'conceited?' is the definition.
(I know that bigheaded can be written as vain)
'up north a sign of what's' is the wordplay.
'up north' says the letters should be written in reverse (like on a map - reverse order in down clue).
'sign' becomes 'v' (a V-sign a gesture made with two fingers).
'of what' becomes 'in' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'v'='av'
'av' backwards is 'va'.
'va'+'in'='VAIN'
Can you help me to learn more?
(Other definitions for vain that I've seen before include "Conceited - futile" , "Conceited, puffed-up" , "Having too much pride in one's appearance" , "Conceited - or hopeless" , "Swollen-headed" .)