A way to trap bishop overseas (6)
I believe the answer is:
abroad
'overseas' is the definition.
(I know this)
'a way to trap bishop' is the wordplay.
'way' becomes 'road' (road is a kind of way).
'to trap' indicates putting letters inside.
'bishop' becomes 'B' (chess abbreviation).
'a'+'road'='aroad'
'aroad' placed around 'b' is 'ABROAD'.
(Other definitions for abroad that I've seen before include "In a foreign country" , "in the field" , "in Paris, perhaps" , "At large - overseas" , "At large; widely current" .)