Prohibits importing European haricots? (5)
I believe the answer is:
beans
'haricots?' is the definition.
(haricot is a kind of bean)
'prohibits importing european' is the wordplay.
'prohibits' becomes 'bans' (banning is a kind of prohibiting).
'importing' indicates putting letters inside.
'european' becomes 'E' (abbreviation e.g. EU).
'bans' placed around 'e' is 'BEANS'.
(Other definitions for beans that I've seen before include "Coffee seeds" , "nuts" , "Pulses, tomato sauce and grilled bread" , "Edible kidney-shaped seeds" , "Nothing at all in US" .)