Bay - and yet not bay perhaps (6)
I believe the answer is:
botany
'bay and' is the definition.
I can't judge whether this definition defines the answer.
'not bay perhaps' is the wordplay.
'perhaps' indicates anagramming the letters.
'not'+'bay'='notbay'
'notbay' with letters rearranged gives 'BOTANY'.
'yet' acts as a link.
Can you help me to learn more?
(Other definitions for botany that I've seen before include "Plant study" , "Unlucky, doomed" , "Science of plant life" , "nature study" , "Science of plants" .)