It can be found in bathroom, note (6)
I believe the answer is:
loofah
'it can be found' is the definition.
The definition suggests a singular noun which matches the answer.
'bathroom note' is the wordplay.
'bathroom' becomes 'loo' (loo is a kind of bathroom).
'note' becomes 'fah' (fourth note in sol-fa notation, anglicized version).
'loo'+'fah'='LOOFAH'
'in' acts as a link.
(Other definitions for loofah that I've seen before include "Dried pod commonly used as bathroom sponge" , "Washing aid" , "Kind of bathroom sponge for rubbing back" , "Bathroom sponge made of halo" , "Dishcloth gourd" .)