Raze the apartment between nine and eleven (7)
I believe the answer is:
flatten
'raze' is the definition.
(I've seen this before)
'the apartment between nine and eleven' is the wordplay.
I cannot really see how this works, but
'apartment' could be 'flat' (synonyms) and 'flat' is found in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
The remaining letters 'te' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for flatten that I've seen before include "Knock to the ground" , "Make smooth or level" , "Squash" , "'Crush, trample (7)'" , "Even" .)