Crossword Genius

For instance, first row in an examination (7)

Ross

I believe the answer is:

ordinal

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'for instance first' is the definition.
I can't tell whether this defines the answer.

'row in an examination' is the wordplay.
'row' becomes 'din' (both can mean a loud disturbance).
'in' means one lot of letters goes inside another.
'an examination' becomes 'oral' (oral is a kind of examination).
'din' inserted inside 'oral' is 'ORDINAL'.

Can you help me to learn more?

(Other definitions for ordinal that I've seen before include "Ranking number" , "Numerals such as first and second" , "First, second, third could be such a numeral" , "Roman Catholic service book" , "Type of number" .)

I've seen this clue in The Hindu.
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