Toilet sign gives me both poles (4)

'toilet' is the definition.
(men's is a kind of toilet)

'sign gives me both poles' is the wordplay.
I cannot quite understand how this works, but
'me' is found in the answer.
'poles' could be 'ns' (North and South poles) and 'ns' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?