Consecrate head of banking? Not so much (5)
I believe the answer is:
bless
'consecrate' is the definition.
(synonyms)
'head of banking? not so much' is the wordplay.
'head of' says to take the initial letters.
'not so much' becomes 'less' (I've seen this before).
The initial letter of 'banking' is 'b'.
'b'+'less'='BLESS'
(Other definitions for bless that I've seen before include "Sanctify" , "Anoint" , "Order of service" , "Praise - consecrate" , "Endow; praise" .)