Crossword Genius

Lots of people run in underpants (6)

Ross

I believe the answer is:

throng

'lots of people' is the definition.
(term for a crowd or group)

'run in underpants' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'in' is an insertion indicator.
'underpants' becomes 'thong' (thong is a type of underwear).
'r' inserted within 'thong' is 'THRONG'.

(Other definitions for throng that I've seen before include "Large gathering of people" , "Large packed crowd" , "Large densely-packed crowd" , "Come in great numbers" , "A crowded mass of people" .)

I've seen this clue in The Guardian.
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