One's job is to stand over part of the oven going all the way back (5)
I believe the answer is:
remit
'over part of the oven going all the way back' is the definition.
I can't tell whether this definition defines the answer.
'one's job is to stand' is the wordplay.
'one's job' becomes 'rem' (I can't explain this - if you can you should believe this answer much more).
'stand' says to take the initial letters (I've seen 'standing' mean this).
The initial letters of 'is to' is 'it'.
'rem'+'it'='REMIT'
Can you help me to learn more?
(Other definitions for remit that I've seen before include "Defer" , "Transfer - area of authority" , "The - Papers (M. Amis)" , "instructions required" , "Give up" .)