Chewed European snack (4)
I believe the answer is:
bite
'snack' is the definition.
(synonyms)
'chewed european' is the wordplay.
'chewed' becomes 'bit'.
'european' becomes 'E' (abbreviation e.g. EU).
'bit'+'e'='BITE'
(Other definitions for bite that I've seen before include "Light meal" , "power" , "(Of fish) take the bait" , "Snake or insect wound" , "Grip with teeth" .)