Second type of meat is fake (4)
I believe the answer is:
sham
'is fake' is the definition.
(sham can mean fake or pretend)
'second type of meat' is the wordplay.
'second' becomes 's' (common abbreviation).
'type of meat' becomes 'ham' ().
's'+'ham'='SHAM'
(Other definitions for sham that I've seen before include "Cheap falseness" , "Unreal" , "Mash, being false" , "Not what it seems to be" , "Pretence, hoax" .)