Singular date for Roman teams (5)

I believe the answer is:

sides

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'roman teams' is the definition.
'sides' can be an answer for 'teams' (eg football sides). I am not sure about the 'roman' bit.

'singular date' is the wordplay.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'date' becomes 'ides' (I've seen this before).
's'+'ides'='SIDES'

'for' is the link.

Can you help me to learn more?

(Other definitions for sides that I've seen before include "Outer edges, left and right" , "Lines" , "Borders?" , "Faces" , "parties" .)

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