Uniform, novel colour shown (7)
I believe the answer is:
ushered
'shown' is the definition.
('usher' can be a synonym of 'show')
'uniform novel colour' is the wordplay.
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'novel' becomes 'she' (novel by H Rider Haggard).
'colour' becomes 'red' (red is a kind of colour).
'u'+'she'+'red'='USHERED'
(Other definitions for ushered that I've seen before include "Escorted" , "Showed people to seats as in cinemas or theatre" , "Led" , "Showed to a seat" , "Conducted" .)