Colouring when second offence is detailed (7)
I believe the answer is:
saffron
'colouring' is the definition.
(saffron is a kind of colouring)
'when second offence is detailed' is the wordplay.
'when second' becomes 's' (common abbreviation. I am not sure about the 'when' bit.**).
'offence' becomes 'affront' (affront is a kind of offence).
'is detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'affront' with its last letter removed is 'affron'.
's'+'affron'='SAFFRON'
Can you help me to learn more?
(Other definitions for saffron that I've seen before include "Orange flower part used in flavouring food" , "spicy" , "Fans for, say orange food flavour and colouring" , "Golden yellow" , "Flavouring derived from a species of crocus" .)