Pass through Portugal before receiving something to eat (8)
I believe the answer is:
permeate
'pass through' is the definition.
(I've seen this before)
'portugal before receiving something to eat' is the wordplay.
'portugal' becomes 'p'.
'before' becomes 'ere' (usually literary).
'receiving' indicates putting letters inside.
'something to eat' becomes 'meat' (meat is a kind of food**).
'ere' going around 'meat' is 'ermeate'.
'p'+'ermeate'='PERMEATE'
(Other definitions for permeate that I've seen before include "Percolate" , "Seep through" , "Imbue, spread through" , "Spread right through" , "Spread or diffuse through" .)