Somehow came top (4)
I believe the answer is:
acme
'top' is the definition.
('acme' can be a synonym of 'top')
'somehow came' is the wordplay.
'somehow' indicates an anagram.
'came' is an anagram of 'ACME'.
(Other definitions for acme that I've seen before include "Height of perfection" , "Culminating point" , "Aim of mountaineers" , "Came awkwardly to the highest point" , "Highest point of excellence or achievement" .)