Is obliged to take part in the chase (3)
I believe the answer is:
has
'is obliged' is the definition.
'part in the chase' is the wordplay.
'part in' indicates the answer is hidden within the clue.
'HAS' is hidden within 'chase'.
'to take' is the link.
(Other definitions for has that I've seen before include "Possesses or owns" , "Cheats" , "Eats" , "Enjoys" , "Gives birth to" .)