Day in Kent to see Foreigner (5)
I believe the answer is:
swede
'foreigner' is the definition.
(I've seen this before)
'day in kent' is the wordplay.
'day' becomes 'wed' (abbreviation for Wednesday).
'in' is an insertion indicator.
'kent' becomes 'se' (Kent is part of the South East of England).
'wed' going within 'se' is 'SWEDE'.
'to see' acts as a link.
(Other definitions for swede that I've seen before include "Root vegetable - European" , "N European" , "plant" , "Large root vegetable" , "Cattle fodder" .)