We name a feeble fellow (4)
I believe the answer is:
weed
'a feeble fellow' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'we name' is the wordplay.
'name' becomes 'ed' (short for Edward).
'we'+'ed'='WEED'
Can you help me to learn more?
(Other definitions for weed that I've seen before include "Cannabis; feeble person" , "Hoe to remove it" , "Plant growing in the wrong place!" , "Useless plant - useless person" , "Plant growing where it is not wanted" .)