Cleaner put off bloke (9)
I believe the answer is:
detergent
'cleaner' is the definition.
(chemical that cleans)
'put off bloke' is the wordplay.
'put off' becomes 'deter' (both can mean to discourage).
'bloke' becomes 'gent' (I've seen this before).
'deter'+'gent'='DETERGENT'
(Other definitions for detergent that I've seen before include "Get tender (anag)" , "Cleansing substance used for washing clothes" , "Synthetic cleaning substance for washing machines" , "Cleansing solvent" , "help with the washing-up" .)