Crossword Genius

Now, their frolicking became tiresome (4,4)

Ross

I believe the answer is:

wore thin

'became tiresome' is the definition.
(I've seen this in another clue)

'now their frolicking' is the wordplay.
'frolicking' is an anagram indicator.
'now'+'their'='nowtheir'
'nowtheir' with letters rearranged gives 'WORE THIN'.

I've seen this clue in The Independent.
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