Colour in Brighton expected (4)
I believe the answer is:
tone
'colour' is the definition.
(tone is a kind of colour)
'in brighton expected' is the wordplay.
'in' indicates a hidden word.
'TONE' is hidden in the letters of 'brighton expected'.
(Other definitions for tone that I've seen before include "Bodily firmness" , "Quality of a musical or vocal sound" , "Note as in voice" , "Sound signal on a telephone" , "Pitch of a voice" .)