Miscalculate, turning right again (3)
I believe the answer is:
err
'miscalculate' is the definition.
(thesaurus)
'turning right again' is the wordplay.
'turning' says the letters should be written backwards.
'right' becomes 'r' (common abbreviation).
'again' becomes 're'.
'r'+'re'='rre'
'rre' reversed gives 'ERR'.
(Other definitions for err that I've seen before include "Transgress" , "Make a wrong move" , "'To . . . is human, to forgive divine'" , "Be inaccurate" , "Miss the mark" .)