Crossword Genius

Look who just walked in to gossip about man downstairs (5,2,3,5)

Ross

I believe the answer is:

speak of the devil

I'm a little stuck... Click here to teach me more about this clue!

'look who just walked in to gossip' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'about man downstairs' is the wordplay.
I cannot quite see how this works, but
'about' could be 'of' and 'of' is found in the answer.
'man' could be 'dev' and 'dev' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish Times.
Want a hint initially instead of a full solution? Install my app