Song about a bishop in part of Asia (6)
I believe the answer is:
arabia
'part of asia' is the definition.
(Arab region of Asia)
'song about a bishop' is the wordplay.
'song' becomes 'aria' (piece of music in an opera).
'about' indicates putting letters inside.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'a'+'b'='ab'
'aria' placed around 'ab' is 'ARABIA'.
'in' is the link.
(Other definitions for arabia that I've seen before include "Peninsula of SW Asia" , "Asian peninsular" , "Middle East region" , "Peninsula in southwest Asia" , "Middle Eastern region" .)