Daily sex sorted out learning difficulty (8)
I believe the answer is:
dyslexia
'learning difficulty' is the definition.
'daily sex sorted out' is the wordplay.
'sorted out' indicates an anagram.
'daily'+'sex'='dailysex'
'dailysex' anagrammed gives 'DYSLEXIA'.
(Other definitions for dyslexia that I've seen before include "Word-blindness" , "Abnormal difficulty in reading or spelling" , "Misinterpreting words" , "Disorder involving words" , "form of blindness" .)