Does the peach ensemble badly need to be marked down? (9)

'does the peach ensemble' is the definition.
I can't tell whether this definition defines the answer.

'badly need to be marked down?' is the wordplay.
'badly' indicates an anagram (letters in the wrong order).
'to' means one lot of letters go next to another (I've seen this in other clues).
'be marked down?' becomes 'cheap' (I am not sure about this - if you are sure you should believe this answer much more).
'need' with letters rearranged gives 'ened'.
'ened' put after 'cheap' is 'CHEAPENED'.

Can you help me to learn more?