### Clue: Blind partner and uncle dancing merengue ultimately is filth (9)
### Answer: EFFLUENCE 
 ### Explanation: Definition: filth
 EFF(as in "eff and blind";to use obscene language) **plus**(and) **anagram of**(dancing) UNCLE + **the last letter of**(… ultimately) "merengue ".
Defn: Waste product.