Crossword Genius

In brief, nothing but the royal train (5)

Ross

I believe the answer is:

court

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

'the royal train' is the definition.
'court' can be an answer for 'train' (thesaurus). I'm unsure of the 'the royal' bit.

'in brief nothing' is the wordplay.
'in' is an insertion indicator.
'brief' becomes 'curt' (synonyms).
'nothing' becomes 'O' (looks like zero - 0).
'curt' going around 'o' is 'COURT'.

'but' acts as a link.

Can you help me to learn more?

(Other definitions for court that I've seen before include "Sports area; woo" , "Tennis arena" , "Judicial body" , "SECOND PART OF 5" , "Tennis playing area" .)

I've seen this clue in the Evening Standard.
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