Followers of cricket might find 1 Across in today’s cryptic crossword in The Times easier than most.
The straight part of the clue is ‘Primate’.
The cricket ground in question is Lord’s. Replacing ‘duke’ with ‘one’ is another way of saying: replace ‘d’ with ‘i’.
‘Duke’ represents the letter ‘d’ and ‘i’ means ‘one’ because it looks the same as one in Roman numerals.
By taking these steps you can see how Lord’s becomes LORIS (a species of primate native to Asia).