Though having the power, gets nothing right on test (5)
I believe the answer is:
motor
'though having the power' is the definition.
I can't judge whether this definition defines the answer.
'nothing right on test' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'right' becomes 'r' (abbreviation).
'on' means one lot of letters go next to another.
'test' becomes 'mot' (as in an MOT test for a vehicle).
'o'+'r'='or'
'or' put after 'mot' is 'MOTOR'.
'gets' acts as a link.
Can you help me to learn more?
(Other definitions for motor that I've seen before include "Car (colloq,)" , "(Transport using) engine" , "Engine - relating to movement" , "Move quickly" , "Wheels" .)