### Clue: 15-cc turbo-assisted bike initially gets rickety on slope (10)
### Answer: TABLESPOON 
 ### Explanation: Definition: 15-cc
 **The 1st letters, respectively, of**(… initially) "turbo-assisted bike" **plus**(gets) **anagram of**(rickety) ON SLOPE.
Defn: 15 cubic centimetres or millilitres, the volume of a tablespoonful of liquid.