Device with a rotating drum used for hauling in 43Ds (7)
I believe the answer is:
capstan
'device' is the definition.
(capstan is a kind of device)
'a rotating drum used for hauling in 43ds' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'with' acts as a link.
Can you help me to learn more?
(Other definitions for capstan that I've seen before include "Device winding in rope" , "Apparatus to wind cable" , "One used to wind" , "Machine for hauling in ropes" , "Ship's windlass used for lifting heavy weights" .)