Bird seen in the broccoli (3)
I believe the answer is:
roc
'bird' is the definition.
(mythological bird of prey)
'in the broccoli' is the wordplay.
'in' says the answer is hidden in the clue.
'ROC' is hidden within 'broccoli'.
'seen' acts as a link.
(Other definitions for roc that I've seen before include "Sinbad's monster bird" , "Enormous, mythical bird of prey" , "Mythical bird; sounds like boulder" , "Sinbad's giant bird" , "Legendary thing" .)