Crossword Genius

"I had a joke about oil, but I'm still refining it," e.g. (7)

Ross

I believe the answer is:

groaner

(Other definitions for groaner that I've seen before include "corny joke" , "One displaying agony" , "One reacting to pun perhaps" , "The old - - (Bing Crosby)" .)

I've seen this clue in The Washington Post.
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