Original American term for "ultra cheap shot" (6)
I believe the answer is:
apache
'original american' is the definition.
(Native American)
'term for ultra cheap shot' is the wordplay.
'term for' says to take the final letters (the letter which terminates the word).
'shot' indicates anagramming the letters.
The final letter of 'ultra' is 'a'.
'cheap' with letters rearranged gives 'pache'.
'a'+'pache'='APACHE'
(Other definitions for apache that I've seen before include "Indian brave" , "American Indian of New Mexico and Arizona" , "Member of a native American people" , "Indians" , "American speech" .)