We can do with it (7)
I believe the answer is:
ability
'it' is the definition.
The definition suggests a singular noun which matches the answer.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ability that I've seen before include "Capability, competence" , "Gift" , "Strength" , "Power or skill to do" , "Quality of being capable of doing something" .)