Arrest leaders of All Blacks on rugby tour (5)
I believe the answer is:
abort
'arrest' is the definition.
'leaders of all blacks on rugby tour' is the wordplay.
'leaders of' indicates taking the first letters.
The first letters of 'all blacks on rugby tour' is 'ABORT'.
(Other definitions for abort that I've seen before include "Bring further progress to an end" , "Bring to premature conclusion" , "[FINISH] prematurely" , "Cut short" , "Stop prematurely" .)