Hi Honey,
What I could gather from your post is you have some duplicate entries in the return clarification lot which are redundant and you want to get rid-off those entries from the System.
Though there is no standard transaction to perform this, I would recommend you to transfer these return postings from the return clarification account back to the bank clearing acount.
Once you perform this from the return clarification worklist, the status of the item is set ti completed (Status 03).
Now, you can delete this item indiviudally from the return clariifcation worklist or can use the transaction FPCFDEL for performing the deletion.
Hope it helps...
Thanks,
Amlan