Millions consume beef for example (4)
I believe the answer is:
meat
'beef for example' is the definition.
(I know that beef is a type of meat)
'millions consume' is the wordplay.
'millions' becomes 'm' (abbreviation).
'consume' becomes 'eat' (eating is a kind of consuming).
'm'+'eat'='MEAT'
(Other definitions for meat that I've seen before include "Eg, beef or pork" , "Food for carnivores" , "The flesh of animals as food" , "Spam, ham, lamb etc" , "Flesh for eating" .)