Eccentric is near, having come up (6)
I believe the answer is:
arisen
'up' is the definition.
(I've seen this in another clue)
'eccentric is near' is the wordplay.
'eccentric' indicates an anagram.
'is'+'near'='isnear'
'isnear' is an anagram of 'ARISEN'.
'having come' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for arisen that I've seen before include "Sprung up" , "Up on the rocks" , "Come to light" , "(Having) occurred" , "(Has) come into view; (has) originated (from)" .)