Prepare component in urea dye (5)
I believe the answer is:
ready
'prepare' is the definition.
(synonyms)
'component in urea dye' is the wordplay.
'component in' indicates the answer is hidden within the clue.
'READY' is hidden within 'urea dye'.
(Other definitions for ready that I've seen before include "bread" , "Primed" , "for immediate use" , "Suitably prepared" , "Intelligent" .)