Hemp for making sails (5)
I believe the answer is:
sisal
'hemp' is the definition.
(I've seen this in another clue)
'making sails' is the wordplay.
'making' indicates an anagram.
'sails' with letters rearranged gives 'SISAL'.
'for' is the link.
(Other definitions for sisal that I've seen before include "Sails (anag) - fibre" , "Fibrous plant used for rope" , "Agave yielding fibre" , "Agave cultivated for its fibre" , "Plant fibre used to make string" .)