Serve up your wildebeest, pig - fast! (2,6)

I believe the answer is:

go hungry

'fast' is the definition.
(I've seen this before)

'serve up your wildebeest pig' is the wordplay.
'serve up' shows that the letters should be reversed in order.
'your' becomes 'yr'.
'wildebeest' becomes 'gnu' ('gnu' can be a synonym of 'wildebeest').
'pig' becomes 'hog' ('hog' can be a synonym of 'pig').
'yr'+'gnu'+'hog'='yrgnuhog'
'yrgnuhog' back-to-front is 'GO HUNGRY'.

(Another definition for go hungry that I've seen is " fast".)

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app