Rows in judicial buildings - good manners needed (11)

I believe the answer is:

courtliness

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

'buildings good manners needed' is the definition.
I can't tell whether this defines the answer.

'rows in judicial' is the wordplay.
'rows' becomes 'lines' (I've seen this in another clue).
'in' is an insertion indicator.
'judicial' becomes 'courts' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'lines' put into 'courts' is 'COURTLINESS'.

Can you help me to learn more?

I've seen this clue in The Irish News.

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