Drop the girl who's no good as a child minder? (4,1,6)

'a child minder?' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'drop the girl who's no good as' is the wordplay.
I cannot really understand how this works, but
'drop' could be 'miss' (synonyms) and 'miss' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
'as' is found in the answer.
The remaining letters 'iter' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?