A second-half goal from Oxford's well-travelled former Wolves midfielder Jame Henry proved to be enough to secure a spot in the much-coveted Third Round for Karl Robinson's in-form side.
Clarke, who had spoken of his desire to upset the odds heading into the match, admitted that the visitors deserved their win as they continued their run of form which now stretches to sixteen all-competition outings.
The gaffer did admit that his team did well for spells of the match but have to work on that killer instinct as they had opportunities to score a goal of their own but the chances ultimately went begging.
The gaffer did admit that his team did well for spells of the match but have to work on that killer instinct as they had opportunities to score a goal of their own but the chances ultimately went begging.