This cancellation of a flat making you wild (7)
I believe the answer is:
natural
'wild' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for natural that I've seen before include "Uncultivated" , "One regarded as sure to succeed in some field" , "Unaffected - innate" , "Not artificial; off-white" , "Unrefined person" .)