One taken in by copies turning up in colour (5)
I believe the answer is:
sepia
'colour' is the definition.
(I know that sepia is a colour)
'one taken in by copies turning up' is the wordplay.
'one' becomes 'i' (Roman numeral).
'taken in by' indicates putting letters inside.
'copies' becomes 'apes' ('ape' can be a synonym of 'copy').
'turning up' shows that the letters should be reversed in order.
'i' put into 'apes' is 'aipes'.
'aipes' in reverse letter order is 'SEPIA'.
'in' acts as a link.
(Other definitions for sepia that I've seen before include "Colour of old photographs" , "Brown colour of old photo" , "Sort of drawing" , "Sort of ink" , "Brown pigment produced from cuttlefish ink" .)