A bird? Yes, with a pretty tail (3)
I believe the answer is:
jay
'a bird?' is the definition.
(jay is a kind of bird)
'yes with a pretty tail' is the wordplay.
'yes' becomes 'j' (I can't justify this - if you can you should believe this answer much more).
'with' means one lot of letters go next to another.
'tail' says to take the final letters.
The last letter of 'pretty' is 'y'.
'j'+'a'+'y'='JAY'
Can you help me to learn more?
(Other definitions for jay that I've seen before include "Garden bird" , "Colourful type of crow" , "Bird of the crow family with blue plumage" , "Colourful member of crow family" , "-- Gatsby, F. Scott Fitzgerald character" .)