Portion of rabbit (3)
I believe the answer is:
bit
'portion' is the definition.
(both can mean a part of something)
'rabbit' is the wordplay.
'BIT' is hidden in amongst the letters.
However, I am not sure how this is indicated.
'of' is the link.
Can you help me to learn more?
(Other definitions for bit that I've seen before include "Between horse's teeth, this loses control" , "Mouthpiece of brindle or tip of drilling tool" , "something boring" , "Binary digit; small piece" , "Cutting head of a drill" .)