Yankee travels around Delaware showing unassisted organ of sight (5,3)
I believe the answer is:
naked eye
'sight' is the definition.
(I have seen 'Unassisted sight ' mean 'naked eye' so perhaps 'sight' could also mean 'naked eye')
'yankee travels around delaware' is the wordplay.
'travels' indicates anagramming the letters.
'around' is an insertion indicator.
'delaware' becomes 'DE' (standard two letter abbrev).
'yankee' with letters rearranged gives 'nakeye'.
'nakeye' enclosing 'de' is 'NAKED EYE'.
'showing unassisted organ of' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for naked eye that I've seen before include "Natural vision" , "With which to observe" , "Unassisted vision" , "Unenhanced vision" , "Unaided vision" .)