Miss, oddly running behind toilet, appears suddenly (5)
I believe the answer is:
looms
'appears suddenly' is the definition.
'looms' can be an answer for 'appears' (looming is a kind of appearing). I am not sure about the 'suddenly' bit.
'miss oddly running behind toilet' is the wordplay.
I cannot really understand how this works, but
'toilet' could be 'loo' (loo can informally mean a toilet) and 'loo' is present in the answer.
The remaining letters 'ms' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for looms that I've seen before include "More than one machine" , "Rises threateningly ahead with weaving machines" , "appears indistinctly" .)