Murphy arranges endless parties (6)
I believe the answer is:
pratie
'murphy' is the definition.
(I've seen this before)
'arranges endless parties' is the wordplay.
'arranges' indicates an anagram (I've seen 'arranging' mean this).
'endless' means to remove the last letter.
'parties' with its last letter taken away is 'partie'.
'partie' is an anagram of 'PRATIE'.
(Other definitions for pratie that I've seen before include "Murphy" , "Potato, in the vernacular" .)