Cleaner to fix plant outside entrance to bathroom (9)
I believe the answer is:
nailbrush
'cleaner' is the definition.
(something which cleans nails)
'fix plant outside entrance to bathroom' is the wordplay.
'fix' becomes 'nail' (I've seen this before).
'plant' becomes 'rush' (rush is a type of plant).
'outside' indicates putting letters inside.
'entrance to' says to take the initial letters.
The first letter of 'bathroom' is 'b'.
'nail'+'rush'='nailrush'
'nailrush' placed around 'b' is 'NAILBRUSH'.
'to' acts as a link.
(Other definitions for nailbrush that I've seen before include "Item used in manicure" , "Shun Blair (anag)" , "Cleaning device" , "Cleaner" , "Use this to clean claws" .)