Meat company during prohibition (5)
I believe the answer is:
bacon
'meat' is the definition.
(bacon is a kind of meat)
'company during prohibition' is the wordplay.
'company' becomes 'co' (abbreviation).
'during' means one lot of letters goes inside another.
'prohibition' becomes 'ban' (ban is a kind of prohibition).
'co' put into 'ban' is 'BACON'.
(Other definitions for bacon that I've seen before include "Breakfast food" , "Artist - meat" , "What could be treated by frier" , "Sizzling" , "Shakespeare's ghost, some say" .)