Crossword Genius

It was a habit in Ancient Rome (4)

Ross

I believe the answer is:

toga

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

'habit in ancient rome' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'it was a' is the wordplay.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'was' becomes 'og' (I can't justify this - if you can you should give a lot more credence to this answer).
't'+'og'+'a'='TOGA'

Can you help me to learn more?

(Other definitions for toga that I've seen before include "Outer garment" , "This ancient robe might get your goat" , "Robe of ancient Rome" , "Cloak of ancient Rome" , "Got a robe for an old Roman" .)

I've seen this clue in The Globe and Mail.
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