Fastball, in slang

This time we are looking on the crossword clue for: Fastball, in slang.
it’s A 18 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: HEAT, CHEESE, HEATER.

Last seen on: –Thomas Joseph – King Feature Syndicate Crossword – Jul 23 2019
Thomas Joseph – King Feature Syndicate Crossword – Dec 19 2018
Wall Street Journal Crossword – Sep 29 2018 – Frequent Stops