Such a clue for COCK might  adult male of the domestic fowl .
( ( ( Such ( a clue ) ) ( for COCK ) ) ( ( might ( adult ( male ( of ( the ( domestic fowl ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (PDT Such) (DT a) (NN clue)) (PP (IN for) (NP (NNP COCK)))) (VP (MD might) (VP (VB adult) (NP (NP (NN male)) (PP (IN of) (NP (DT the) (JJ domestic) (NN fowl)))))) (. .)))
The word "cock" refers to reptiles and not birds. 
( ( The ( word ( `` ( cock '' ) ) ) ) ( ( refers ( to ( ( reptiles and ) ( not birds ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN word) (`` ``) (NN cock) ('' '')) (VP (VBZ refers) (PP (TO to) (NP (NP (NNS reptiles)) (CC and) (NP (RB not) (NNS birds))))) (. .)))