Exhausted European member of parliament changed diet (7)
I believe the answer is:
emptied
'exhausted' is the definition.
(I've seen this before)
'european member of parliament changed diet' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'member of parliament' becomes 'mp' (I've seen this in other clues).
'changed' is an anagram indicator.
'diet' with letters rearranged gives 'tied'.
'e'+'mp'+'tied'='EMPTIED'
(Other definitions for emptied that I've seen before include "Vacated" , "Evacuated" , "gutted" , "Made vacant" , "was draining" .)