Chaser collapsed in hunt (6)
I believe the answer is:
search
'hunt' is the definition.
('search' can be a synonym of 'hunt')
'chaser collapsed' is the wordplay.
'collapsed' indicates an anagram.
'chaser' with letters rearranged gives 'SEARCH'.
'in' acts as a link.
(Other definitions for search that I've seen before include "Scour, seek" , "Examine (to find something)" , "Frisk" , "Try to locate" , "Try to find something by looking" .)