Crossword Genius

Betray twenty in Rome? (6,5)

Ross

I believe the answer is:

double cross

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

'betray twenty in rome?' is the definition.
'double cross' can be an answer for 'betray' (doubling cross is a kind of betraying). I'm unsure of the 'twenty in rome?' bit.

'betray twenty in rome?' is the wordplay.
'betray' becomes 'double+' (I've seen this in another clue).
'twenty in rome?' becomes 'cross' (I can't justify this - if you can you should give a lot more credence to this answer).
'double'+'cross'='DOUBLE-CROSS'

Can you help me to learn more?

(Other definitions for double cross that I've seen before include "Betrayal" , "Betray -- XX?" , "Betray while feigning help" , "Deceive supposed ally" , "Defraud" .)

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