Cleaner put off, man! (9)
I believe the answer is:
detergent
'cleaner' is the definition.
(detergent is a kind of cleaner)
'put off man' is the wordplay.
'put off' becomes 'deter' (both can mean to discourage).
'man' becomes 'gent' (gent is a kind of man).
'deter'+'gent'='DETERGENT'
(Other definitions for detergent that I've seen before include "Soapless cleanser" , "Cleaning product" , "Soluble cleanser" , "Soluble cleansing agent" , "Synthetic cleaning substance for washing machines" .)