Anagram I use is ed's problem for later (4,5)
I believe the answer is:
side issue
'problem for later' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'anagram i use is ed's' is the wordplay.
'anagram' indicates an anagram.
'i'+'use'+'is'+'eds'='iuseiseds'
'iuseiseds' with letters rearranged gives 'SIDE-ISSUE'.
Can you help me to learn more?
(Other definitions for side issue that I've seen before include "Illegitimate children" , "Incidental minor matter" , "Adjunct" , "minor affair" , "matter of lesser importance" .)