One wearing ring turned a pale colour (5)
I believe the answer is:
lilac
'a pale colour' is the definition.
'one wearing ring turned' is the wordplay.
'one' becomes 'i' (Roman numeral).
'wearing' is an insertion indicator.
'ring' becomes 'call' ('call' can be a synonym of 'ring').
'turned' says the letters should be written backwards.
'i' going into 'call' is 'calil'.
'calil' written backwards gives 'LILAC'.
(Other definitions for lilac that I've seen before include "I call (anag)" , "Fragrant shrub; colour" , "Plant" , "Tree - pinkish-purple colour" , "garden ornamental" .)