The whole mess I enter (6)
I believe the answer is:
entire
'the whole' is the definition.
(I've seen this before)
'mess i enter' is the wordplay.
'mess' indicates an anagram.
'i'+'enter'='ienter'
'ienter' with letters rearranged gives 'ENTIRE'.
(Other definitions for entire that I've seen before include "in one piece" , "Complete, intact" , "Unharmed - total" , "everything" , "Lure" .)