Catch the captain (4)
I believe the answer is:
hook
I believe this is a double definition.
'catch' is the first definition.
(I know that hook is a type of catch)
'captain' is the second definition.
(I've seen this before)
'the' is the link.
(Other definitions for hook that I've seen before include "One baited for fish" , "It's bent to catch or hold" , "Attacking shot" , "Short swinging punch" , "Bad golf shot" .)