Trust me to come out last (9)
I believe the answer is:
uttermost
'last' is the definition.
(I've seen this before)
'trust me to come out' is the wordplay.
'come out' is an anagram indicator.
'trust'+'me'+'to'='trustmeto'
'trustmeto' with letters rearranged gives 'UTTERMOST'.
(Other definitions for uttermost that I've seen before include "The furthest point or degree" , "best" , "Extreme" , "Chief" , "at the furthest limit" .)