Staff plan to hold egg for bird (7)
I believe the answer is:
rooster
'bird' is the definition.
(rooster is a kind of bird)
'staff plan to hold egg' is the wordplay.
I cannot quite understand how this works, but
'egg' could be 'o' (an 'o' resembles an egg) and 'o' is located in the answer.
The remaining letters 'roster' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'for' is the link.
Can you help me to learn more?
(Other definitions for rooster that I've seen before include "So retro (anag.)" , "Bird that wakes up" , "Male hen" , "Toreros (anag.)" , "8 [RURAL] alarm call" .)