Trigger & Store procedure

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SQL

Hi Freinds,
I've written a store procedure for Clerk table and i want when i run the store procedure one trigger happen. I said if the clk_Id when want to delete existence in another table give me a message but my code don't run.
Could you help me?

CREATE Procedure [dbo].[Clerk_Delete]

@clk_Id		int

As
Begin
    Begin Try
        Begin Tran a
            Delete From Clerk
            Where clk_Id = @clk_Id
            Commit Tran a;
    End Try
    Begin Catch
        Rollback Tran a;
    End Catch
End

CREATE Trigger [dbo].[Clerk_Insert_Trigger] on [dbo].[Clerk]
For delete
As
--declare @a int;
--select @a = Clerk.clk_Id from Clerk

If  exists (Select HokmeKargozini.clk_Id  from HokmeKargozini )
Begin
  print 'You don''t remove this clerk ';
  ROLLBACK tran a;
End
else
Begin
    print 'It''s removed ';
End