Left one with a Shakespearean part (6)

I believe the answer is:

portia

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'shakespearean part' is the definition.
The definition suggests a singular noun which matches the answer.

'left one with a' is the wordplay.
'left' becomes 'port' (left side of a ship - opposite of starboard).
'one' becomes 'I' (Roman numeral).
'with' means one lot of letters go next to another.
'port'+'i'+'a'='PORTIA'

Can you help me to learn more?

(Other definitions for portia that I've seen before include "A Shakespearean heroine" , "She judged Shylock (M. of V.)" , "She married Bassanio (Merchant of Venice)" , "Shakespearean character" , "rich heiress" .)

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

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