Naked Yankee claiming length is something over a foot (5)
I believe the answer is:
ankle
'a foot' is the definition.
(thesaurus)
'naked yankee claiming length' is the wordplay.
'naked' means to look at the middle letters (outside letters removed so centre is unclothed).
'claiming' means one lot of letters goes inside another.
'length' becomes 'l' (abbreviation in geometry).
The centre of 'yankee' is 'anke'.
'anke' enclosing 'l' is 'ANKLE'.
'is something over' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for ankle that I've seen before include "Bone over foot" , "Foot-leg connector" , "Major joint in lower limb" , "Low joint" , "Joint between foot and leg" .)