Crossword Genius

In parenthesis, an assurance of correctness (3)

Ross

I believe the answer is:

sic

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

'in parenthesis an assurance of correctness' is the definition.
I can't tell whether this definition defines the answer.

'in parenthesis an' is the wordplay.
'in' means one lot of letters goes inside another.
'parenthesis' becomes 'sc' (I can't justify this - if you can you should give a lot more credence to this answer).
'an' becomes 'i' (Roman numeral for one).
'sc' placed around 'i' is 'SIC'.

Can you help me to learn more?

(Other definitions for sic that I've seen before include "the reading is correct" , "Intentionally so written" , "As it stands, in printing" , "Thus, sounds ill" , "Like" .)

I've seen this clue in the Evening Standard.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.