8 across
Mmmmm
…
sporting
achievement
that
was
hard
to
surpass
(4-6,4)
Mmmmm … sporting achievement that was hard to surpass (4-6,4)
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The definition is at the end of the clue.
How the clue works
The definition is sporting achievement that was hard to surpass, the famous barrier Roger Bannister broke. The wordplay reads "Mmmmm" as four Ms: four minute is spelled out as FOUR MINUTE (M for minute, four times), then a final M stands for MILE, giving FOUR-MINUTE MILE.