Manor transformed into a type of villa (5)

I believe the answer is:

roman

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

'type of villa' is the definition.
'roman' can be an answer for 'type' (variety of type eg Times New Roman). I am unsure of the 'of villa' bit.

'manor transformed into a' is the wordplay.
'manor' anagrams to 'ROMAN'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for roman that I've seen before include "Of an Italian city" , "Caesar among others" , "Non-italic (type)" , "- Empire; - nose" , "Typeface" .)

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

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