Queen wearing gold and a pale blue (4)
I believe the answer is:
aqua
'pale blue' is the definition.
(aqua is a shade of blue)
'queen wearing gold and a' is the wordplay.
'queen' becomes 'Q' (chess abbreviation).
'wearing' means one lot of letters goes inside another.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'and' is a charade indicator (letters next to each other).
'q' put inside 'au' is 'aqu'.
'aqu'+'a'='AQUA'
(Other definitions for aqua that I've seen before include "Latin for water" , "Hue" , "(Denoting) water (Lat)" , "Water (L)" , "Tint of blue" .)