Wear down queen with verse (5)
I believe the answer is:
erode
'wear down' is the definition.
(I've seen this before)
'queen with verse' is the wordplay.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
'with' is a charade indicator (letters next to each other).
'verse' becomes 'ode'.
'er'+'ode'='ERODE'
(Other definitions for erode that I've seen before include "Grind down" , "Become ground down or deteriorate" , "Gradually wear away" , "'Deteriorate, wear away (5)'" , "fragment" .)