One who arranges steps to charge her poor performance (13)
I believe the answer is:
choreographer
'one who arranges steps' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'charge her poor performance' is the wordplay.
'performance' is an anagram indicator.
'charge'+'her'+'poor'='chargeherpoor'
'chargeherpoor' with letters rearranged gives 'CHOREOGRAPHER'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for choreographer that I've seen before include "Isadora Duncan" , "One who creates dance routines" , "One skilled in arranging dances" , "Composer of ballet steps" , "Dance designer" .)