In Pleco, you'd actually do that with a settings change - set "Show" to "Definition" instead of "Headword" on the main flashcard configuration screen. If you'd like to track your results in that mode separately, you can do that by creating a new profile and scorefile (see the manual) specifically for E-C testing. And if you find that the definitions are too long and detailed for this kind of test, you can permanently or temporarily remap them to a different dictionary with shorter definitions - permanently through the Search / Organize Cards "Batch" screen, temporarily (only during the session) through the "Remap cards to dicts" option in the Display panel of Flashcard Testing.