Consecrate as bishop? Not so (5)
I believe the answer is:
bless
'consecrate' is the definition.
('bless' can be a synonym of 'consecrate')
'bishop? not so' is the wordplay.
'bishop?' becomes 'b' (abbreviation used in chess).
'not so' becomes 'less' (I've seen this before).
'b'+'less'='BLESS'
'as' acts as a link.
(Other definitions for bless that I've seen before include "Approve of" , "Order of service" , "Call on God to favour" , "Consecrate; be thankful for" , "Render holy" .)