basic cloning question

[Sarah LaMere]

OK, so you guys helped me amplify my 4 kb fragment from cDNA.  Now I just need to clone it, and it's not cooperating.
 
I'm using Elongase to amplify my product, which includes a proofreading enzyme.  I've been adding A overhangs to my gel product (purified with a millipore kit) and then cloning using the Invitrogen topo TA cloning kit.  It's basically just not working.  Any suggestions for cloning large inserts?
 
Thanks again,
Sarah

		
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