Season broccoli starter and half-cook antelope (9)
I believe the answer is:
springbok
'antelope' is the definition.
(springbok is a kind of antelope)
'season broccoli starter and half-cook' is the wordplay.
'season' becomes 'spring' (spring is a season).
'starter' indicates taking the first letters.
'and' means one lot of letters go next to another.
'half' indicates taking half.
The first letter of 'broccoli' is 'b'.
'cook' with half the letters taken is 'ok'.
'spring'+'b'+'ok'='SPRINGBOK'
(Other definitions for springbok that I've seen before include "Sportsman" , "South African symbol" , "jumper" , "Antelope" , "antelopes" .)