Some strikingly-coloured compound (6)
I believe the answer is:
glycol
'compound' is the definition.
(I've seen this before)
'some strikingly-coloured' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'GLYCOL' is hidden in the letters of 'strikingly coloured'.
(Other definitions for glycol that I've seen before include "Basis of antifreeze" , "Type of compound" .)