Clinton's blast broke a 1-1 tie in the bottom of the fifth inning.
In the nightcap, however, WVU's pitching again broke down in a 7-2 loss. The Mountaineers allowed three runs in both the sixth and seventh innings after taking a 1-0 lead on an RBI single by Clinton.
WVU is now 12-10 overall and 4-3 in the Big East conference. The St. John's doubleheader marks the third straight twinbill where the Mountianeers have dropped the second game after winning the first.