Not thoroughly out of sorts? (6)
I believe the answer is:
unwell
'out of sorts?' is the definition.
(I've seen this before)
'not thoroughly' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'thoroughly' becomes 'well' (I've seen this in another clue).
'un'+'well'='UNWELL'
(Other definitions for unwell that I've seen before include "Quaintly amusing" , "Poorly" , "Ill, not in good health" , "Somewhat ill" , "Out of sorts" .)