Turkey put aside for 50 in staff meal (8)
I believe the answer is:
luncheon
'meal' is the definition.
(luncheon is a kind of meal)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for luncheon that I've seen before include "Midday meal" , "part of formal board" , "formal occasion" , "fare at one?" , "midday menu" .)