Feline of no great weight (5)
I believe the answer is:
ounce
This could be a double definition.
'feline' is the first definition.
(I know that ounce is a type of big cat)
'no great weight' is the second definition.
'ounce' can be an answer for 'weight' (ounce is a kind of weight). I am not sure about the 'no great' bit.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for ounce that I've seen before include "Light weight coming in on cue" , "Small unit of weight" , "Weight; big cat" , "one of several in a pound" , "one of sixteen in a pound" .)