Crossword Genius

Sign on flat toilet without first person (2,3)

Ross

I believe the answer is:

to let

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'sign on flat' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?

'toilet without first person' is the wordplay.
'without' indicates named letters should be taken away.
'first person' becomes 'I' (first-person pronoun).
'toilet' with 'i' taken away is 'TO LET'.

Can you help me to learn more?

(Other definitions for to let that I've seen before include "Notice of vacancy" , "Available for hire" , "open to offers" , "Sign of the property market" , "Sign on property available to rent" .)

I've seen this clue in the Sydney Morning Herald.
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