Sterilisers and cleansers, primarily -- hospital department's smells (6)
I believe the answer is:
scents
'smells' is the definition.
(scent is a kind of smell)
'sterilisers and cleansers primarily hospital department's' is the wordplay.
'sterilisers' becomes 's' (this might be a standard abbreviation I've not previously seen).
'and' means one lot of letters go next to another.
'primarily' indicates taking the first letters.
'hospital department's' becomes 'ENT's' (Ear, Nose and Throat department).
The initial letter of 'cleansers' is 'c'.
's'+'c'+'ents'='SCENTS'
Can you help me to learn more?
(Other definitions for scents that I've seen before include "Fragrances, smells" , "Distinctive odours, usually pleasant" , "Essences and perfumes" , "Trails" .)