"I’m upset over nothing in basic education," one reflects (6)
I believe the answer is:
mirror
'one reflects' is the definition.
'i'm upset over nothing in basic education' is the wordplay.
'upset' says the letters should be written in reverse.
'over' is an insertion indicator.
'nothing in' becomes 'o' (I've seen this in other clues).
'basic education' becomes 'rrr' (the three R's - reading, writing and arithmetic).
'im' reversed gives 'mi'.
'o' inserted within 'rrr' is 'rror'.
'mi'+'rror'='MIRROR'
(Other definitions for mirror that I've seen before include "newspaper" , "1 [UNLUCKY FOR SOME]" , "Reflective surface" , "Glass - paper" , "Reflecting glass" .)