Clubs once used by captains of disorderly crews (5)
I believe the answer is:
irons
'clubs' is the definition.
(I know this)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for irons that I've seen before include "sporting equipment" , "Golfclubs with metal hands" , "English player" , "Presses clothes" , "Jeremy ---, Br. actor; golf clubs" .)