Described in more detail how the lunatic's cell was? (6)
I believe the answer is:
padded
'detail how the lunatic's cell was?' is the definition.
I can't tell whether this definition defines the answer.
'described in more' is the wordplay.
'described in' becomes 'p' (I can't justify this - if you can you should believe this answer much more).
'more' becomes 'added' (similar in meaning).
'p'+'added'='PADDED'
Can you help me to learn more?
(Other definitions for padded that I've seen before include "Kind of soft cell for violent prisoner" , "Filled with wadding" , "Cushioned; moved silently" , "Stuffed with soft material" , "Covered in soft material" .)