Yes, Sarah has this kind of hemp (5)
I believe the answer is:
sisal
'this kind of hemp' is the definition.
(I've seen this in another clue)
'yes sarah' is the wordplay.
'yes' becomes 'si' (I am not sure about this - if you are sure you should believe this answer much more).
'sarah' becomes 'Sal' (Sally is a common pet form of Sarah).
'si'+'sal'='SISAL'
'has' is the link.
Can you help me to learn more?
(Other definitions for sisal that I've seen before include "Rope fibre from leaves of tropical plant" , "Plant fibre used for making rope" , "Plant fibre used to make string" , "Fibre of Mexican agave" , "Fibre used in rope-making" .)