Obsession with dress? (5)
I believe the answer is:
habit
This could be a double definition.
'obsession' is the first definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe there's an association between them I don't understand?
'dress?' is the second definition.
(I know that habit is a type of dress)
'with' is the link.
Can you help me to learn more?
(Other definitions for habit that I've seen before include "Custom - costume" , "What might one have a regular tendency to" , "Custom or monk's robe" , "Acquired pattern of behaviour" , "Custom, nun's wear" .)