Writer's Christmas card impressing bird no end (4,6)
I believe the answer is:
noel coward
'writer's' is the definition.
'christmas card impressing bird no end' is the wordplay.
I cannot quite see how this works, but
'christmas' could be 'noel' (synonyms) and 'noel' is located in the answer.
'no' could be 'o' (O resembles 0) and 'o' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for noel coward that I've seen before include "dramatist" , "He wrote" , "Old playwright" .)