Crafty woman, woman heading off soldier leading other soldiers to ship (11)
I believe the answer is:
'crafty woman woman heading off' is the definition.
I can't tell whether this definition defines the answer.
'leading other soldiers to ship' is the wordplay.
'leading other' becomes 'enchant' (I can't explain this - if you can you should give a lot more credence to this answer).
'soldiers' becomes 're' (Royal Engineers).
'to ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'soldier' acts as a link.
Can you help me to learn more?
(Other definitions for enchantress that I've seen before include "Seducer" , "Female magician" , "One casting spells" , "Circe, for example" , "Siren" .)