A sign to know in Scotland (5)
I believe the answer is:
token
'a sign' is the definition.
(I know that token is Egyptian hieroglyph)
'to know in scotland' is the wordplay.
'know in scotland' becomes 'ken' (Scottish term meaning to know or understand).
'to'+'ken'='TOKEN'
(Other definitions for token that I've seen before include "Symbol; metal disc" , "Indication, symbol or voucher" , "Sign, symbol or an evidence" , "without meaning it" , "Something of sentimental value" .)