A few run out clutching British headwear (8)
I believe the answer is:
sombrero
'headwear' is the definition.
(sombrero is a type of hat)
'a few run out clutching british' is the wordplay.
'a few' becomes 'some' (both can mean a small amount of something).
'run out' becomes 'RO' (cricket abbreviation).
'clutching' indicates putting letters inside.
'british' becomes 'br' (abbreviation for British).
'some'+'ro'='somero'
'somero' enclosing 'br' is 'SOMBRERO'.
(Other definitions for sombrero that I've seen before include "a Mexican's overheads" , "Large Mexican sun-hat" , "Wide-brimmed Mexican hat" , "Hat for South American" , "Broad-brimmed Mexican hat" .)