Bishop to loan mixture (5)
I believe the answer is:
blend
'mixture' is the definition.
(I know that blend is a type of mixture)
'bishop to loan' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'to loan' becomes 'lend' ('lend' can be a synonym of 'loan').
'b'+'lend'='BLEND'
(Other definitions for blend that I've seen before include "Coalesce" , "Fusion" , "Amalgamate" , "Mix together" , "Mix, stir" .)