Marciano beaten demands pasta (8)
I believe the answer is:
macaroni
'pasta' is the definition.
(macaroni is a kind of pasta)
'marciano beaten' is the wordplay.
'beaten' is an anagram indicator (letters beaten up or destroyed).
'marciano' with letters rearranged gives 'MACARONI'.
'demands' is the link.
(Other definitions for macaroni that I've seen before include "Tubed pasta" , "Long thin pasta" , "Short thick tubes of pasta (8)" , "Alternative to 31 [TORTELLINI]" , "being a feather in Yankee's cap?" .)