Repair robe after the Queen's upset (7)
I believe the answer is:
redress
'repair' is the definition.
(thesaurus)
'robe after the queen's upset' is the wordplay.
'robe' becomes 'dress' (I've seen this before).
'after' means one lot of letters go next to another.
'the queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'upset' is a reversal indicator.
'er' back-to-front is 're'.
'dress' put after 're' is 'REDRESS'.
(Other definitions for redress that I've seen before include "Pay" , "Prepare again - satisfaction" , "Reparation" , "Correct" , "Make amends for" .)