Not very bright, about to father baby (6)
I believe the answer is:
midget
'father baby' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'not very bright about to' is the wordplay.
'not very bright' becomes 'dim' (I've seen this before).
'about' is a reversal indicator.
'to' becomes 'get' (I am not sure about this - if you are sure you should believe this answer much more).
'dim' written backwards gives 'mid'.
'mid'+'get'='MIDGET'
Can you help me to learn more?
(Other definitions for midget that I've seen before include "Manikin" , "Dwarf" , "Little person" , "Tiny" , "Happy for one" .)