In no time, they show one to be doubly right (3,5)
I believe the answer is:
two ticks
'be doubly right' is the definition.
I know nothing about this answer so I can't tell whether this works.
'in no time they show one' is the wordplay.
I cannot quite understand how this works, but
'no' could be 'o' (O resembles 0) and 'o' is located in the answer.
'time' could be 't' (abbreviation) and 't' is found in the answer.
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'to' is the link.
Can you help me to learn more?
(Another definition for two ticks that I've seen is " An instant".)