One nerd turns up: here's the answer (1,4)
I believe the answer is:
i know
'the answer' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'one nerd turns up' is the wordplay.
'one' becomes 'i' (Roman numeral).
'nerd' becomes 'wonk' (synonyms).
'turns up' is a reversal indicator.
'wonk' back-to-front is 'know'.
'i'+'know'='I KNOW'
'here's' is the link.
Can you help me to learn more?
(Other definitions for i know that I've seen before include "That's an idea" , "Here's an idea" .)