Pending Suggestions can be removed from withing Donor Central. 
  1. Log into Donor Central
  2. Go to Site Configuration > Admin Portal > Suggestion Admin
  3. Enter a Date Range (required) and the Fund ID of the fund in question. 
  4. Click on the ID Link for the Suggestion that needs to be removed. 
  5. At the bottom of the page, click on the link that says "To Delete this Recommendation, click here".