A duck an alternative to minced meat? (3,1,7)
I believe the answer is:
not a sausage
This clue is a double definition.
'a duck' is the first definition.
(phrase meaning nothing - 'duck' is zero in cricket)
'an alternative to minced meat?' is the second definition.
(sausages are made from minced meat)
(Other definitions for not a sausage that I've seen before include "diddly-squat" , "Alternative to banger, maybe" , "Absolutely nothing" , "Zilch (colloquial)" , "zip" .)