I'm not sure I have completely understood what you mean.

I assume you're saying that the item is "new" but has a problem with it - and you want to include that in the condition description? 

The only options you can use from the condition drop-down list are "New" or "Used" - you can't select the "-"

If the item is new and has a flaw, it's best to still select the "NEW" option from the condition description drop-down list and just clearly note the flaws of the item in the listing description.

If the item is used and has a flaw, once you select "Used" from the drop-down list, you should then be able to type in the blank field whatever you need to regarding the condition. (image attached). 

Alternatively, under the "Item Specifics" section - you can click the link which says "Add your own item specific" and create a field called "Condition" and put your notes re the condition in there - and these will display at the top of your listing description. 

Hope this helps! :]