Staff leave vegetables (9)
I believe the answer is:
mangetout
'vegetables' is the definition.
(I've seen this before)
'staff leave' is the wordplay.
'staff' becomes 'man' (as in staffing or manning a particular place).
'leave' becomes 'getout' (synonyms).
'man'+'getout'='MANGETOUT'
(Other definitions for mangetout that I've seen before include "Type of pea" , "something on the plate" , "Edible pea pods" , "From this pod" , "Sugar peas" .)