Shared out presents he helps to deliver? (6)
I believe the answer is:
dasher
'presents he helps to deliver?' is the definition.
(Dasher is one of Santa's reindeer)
'shared out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'shared' is an anagram of 'DASHER'.
(Other definitions for dasher that I've seen before include "A sprinter, perhaps a Santa's reindeer" , "Member of team pulling together" , "Fast runner" , "Spirited person" , "A sprinter among Santa's reindeer" .)