One who cleans city below with hesitation (9)
I believe the answer is:
launderer
'one who cleans' is the definition.
The definition suggests a singular noun which matches the answer.
'city below with hesitation' is the wordplay.
'city' becomes 'LA' (Los Angeles).
'below' becomes 'under' (synonyms).
'with' means one lot of letters go next to another.
'hesitation' becomes 'er' (sound used when hesitating).
'la'+'under'+'er'='LAUNDERER'
Can you help me to learn more?
(Other definitions for launderer that I've seen before include "Money dealer" , "Cleaner (of clothes, linen)" , "Washer" .)