Too reliant on oven - pretended otherwise (13)
I believe the answer is:
alternatively
'otherwise' is the definition.
(I've seen this before)
'too reliant on oven pretended' is the wordplay.
I cannot really see how this works, but
'on' could be 'at' (I've seen this in other clues) and 'at' is present in the answer.
an anagram of 'reliant' is 'alterni' which is within the left over letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for alternatively that I've seen before include "as another option" , "On the other hand" , "Otherwise" .)