This has no real bite (5,5)

'this' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'no real bite' is the wordplay.
I cannot quite understand how this works, but
'no' could be 'o' (resembles 0 - 'no' can mean 'zero') and 'o' is present in the answer.
'real' could be 'e' (e is a kind of real) and 'e' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

'has' is the link.

Can you help me to learn more?