Ben is out of bed linen that's striped (5)
I believe the answer is:
lined
'that's striped' is the definition.
(I've seen this in another clue)
'ben is out of bed' is the wordplay.
'ben' becomes 'line' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'is' becomes 'be'.
'out of' suggests deleting specific letters.
'bed' with 'be' removed is 'd'.
'line'+'d'='LINED'
'linen' acts as a link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for lined that I've seen before include "Marked by seams or wrinkles" , "Given an inner covering" , "Went along with" , "Covered inside" , "What ruler did" .)