Regularly considered fit? Find out otherwise (2,3)
I believe the answer is:
if not
This clue might be a double definition.
'regularly considered fit? find out' is the first definition.
Both the definition and answer are adverbs. Perhaps there's an association between them I don't understand?
'otherwise' is the second definition.
(synonyms)
Can you help me to learn more?
(Other definitions for if not that I've seen before include "Failing that" , "Unless" .)