Yellow and black bird caught first (6)
I believe the answer is:
craven
'yellow' is the definition.
(thesaurus)
'black bird caught first' is the wordplay.
'black bird' becomes 'raven' (I've seen this before).
'caught' becomes 'c' (cricket abbreviation).
'first' means one lot of letters go next to another.
'raven' put after 'c' is 'CRAVEN'.
'and' is the link.
(Other definitions for craven that I've seen before include "Yellow" , "Faint-hearted" , "Without backbone" , "Contemptibly cowardly" , "Cowardly, spineless" .)