Hotel ordered bachelor to leave unseen (6)
I believe the answer is:
hidden
'unseen' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for hidden that I've seen before include "Concealed, having been put away secretly" , "Unseen" , "behind closed doors" , "Abstruse" , "Concealed, placed out of sight" .)