Courtier is upset with me having beauty not brains (12)
I believe the answer is:
meretricious
'beauty not brains' is the definition.
I can't judge whether this defines the answer.
'courtier is upset with me' is the wordplay.
'upset with' is an anagram indicator.
'courtier'+'is'='courtieris'
'courtieris' mixed up with 'me' can make 'MERETRICIOUS'.
'having' acts as a link.
Can you help me to learn more?
(Other definitions for meretricious that I've seen before include "Flashy" , "Showy" , "Courier-Times (anag) - tacky" , "Superficially attractive but worthless" , "showily attractive" .)