Her sale was out of order (6)
I believe the answer is:
salome
'her' is the definition.
'was out of order' is the wordplay.
'was' becomes 'sale' (I can't justify this - if you can you should give a lot more credence to this answer).
'out of' means one lot of letters goes inside another (some letters on the outside of others).
'order' becomes 'om' (Order of Merit).
'sale' enclosing 'om' is 'SALOME'.
'sale' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for salome that I've seen before include "revealing play" , "18 [OPERA]" , "She danced famously for Herod" , "She danced for the head of John the Baptist" , "Her dancing pleased Herod" .)