Duty of current head of government in offering at Eucharist (10)
I believe the answer is:
obligation
'duty of current head of government' is the definition.
'obligation' can be an answer for 'duty' (synonyms). I am unsure of the 'of current head of government' bit.
'in offering at eucharist' is the wordplay.
'in' indicates putting letters inside.
'offering' becomes 'oblation' (type of religious offering).
'at eucharist' becomes 'ig' (I am not sure about this - if you are sure you should believe this answer much more).
'oblation' enclosing 'ig' is 'OBLIGATION'.
Can you help me to learn more?
(Another definition for obligation that I've seen is " Duty".)