The boat Cathy takes out (5)
I believe the answer is:
yacht
'the boat' is the definition.
(I've seen this before)
'cathy takes out' is the wordplay.
'takes out' indicates anagramming the letters (I've seen 'taken out' mean this).
'cathy' with letters rearranged gives 'YACHT'.
(Other definitions for yacht that I've seen before include "Kind of boat" , "Sailing craft" , "Sailing-boat" , "Cathy (anag.)" , "Light, fast sailing-vessel" .)