Time Henry omitted beginning of the Lord's prayer (3)
I believe the answer is:
our
'beginning of the lord's prayer' is the definition.
('Our Father, who art in heaven')
'time henry omitted' is the wordplay.
'time' becomes 'hour' (hour is a kind of time).
'henry' becomes 'H' (symbol for the unit of electrical inductance).
'omitted' is a deletion indicator.
'hour' with 'h' taken away is 'OUR'.
(Other definitions for our that I've seen before include "Belonging to us" , "Possessed by us" , "Relating to us" , "Yours and mine" , "'-- House' (Madness song)" .)