Attended to bird - one missing small part (5,4)
I believe the answer is:
cameo role
'small part' is the definition.
(I've seen this in another clue)
'attended to bird one missing' is the wordplay.
I cannot quite see how this works, but
'attended' could be 'came' (come can mean to attend) and 'came' is located in the answer.
'one' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
The remaining letters 'role' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for cameo role that I've seen is " Small part in film".)