"Shown in colour," leave out (8)
I believe the answer is:
revealed
'shown' is the definition.
(revealing is a kind of showing)
'in colour leave out' is the wordplay.
'in' means one lot of letters goes inside another.
'colour' becomes 'red' (red is a kind of colour).
'out' is an anagram indicator (out can mean wrong or inaccurate).
'leave' is an anagram of 'veale'.
'red' enclosing 'veale' is 'REVEALED'.
(Other definitions for revealed that I've seen before include "Discovered" , "Made clear and visible" , "Exposed" , "Like the religion" , "Shown" .)