Nonsense to include a second cut of meat (5)
I believe the answer is:
roast
'cut of meat' is the definition.
(roast is a kind of cut of meat)
'nonsense to include a second' is the wordplay.
'nonsense' becomes 'rot' (rot can mean nonsense or rubbish).
'to include' is an insertion indicator.
'second' becomes 's' (common abbreviation).
'a'+'s'='as'
'rot' placed around 'as' is 'ROAST'.
(Other definitions for roast that I've seen before include "Reprimand severely" , "Sunday dinner" , "Traditional Sunday joint?" , "Cook (meat) over a fire" , "Cook; criticise" .)