Work out, as one is turning to the right (6)
I believe the answer is:
reason
'work out' is the definition.
(thesaurus)
'as one is turning to the right' is the wordplay.
'is turning' indicates anagramming the letters.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the right' becomes 'r' (common abbreviation).
'as'+'one'='asone'
'asone' with letters rearranged gives 'eason'.
'eason' after 'r' is 'REASON'.
(Other definitions for reason that I've seen before include "Logic; excuse" , "Justification or motive" , "Reach logical conclusions" , "Purpose" , "Logic, sense" .)