Did this bird never say no? (4)
I believe the answer is:
dodo
'did this bird never' is the definition.
'dodo' can be an answer for 'bird' (dodo is a kind of bird). I am unsure of the remainder of the definition.
'say no?' is the wordplay.
'say' becomes 'dod' (I can't explain this - if you can you should believe this answer much more).
'dod'+'o'='DODO'
Can you help me to learn more?
(Other definitions for dodo that I've seen before include "One deeply reactionary" , "Repetitive extinct animal" , "E [EXTINCT] bird" , "Bird (whose style of very out of fashion)" , "Square" .)