Originally appearing on the forum you should go check it out if you haven’t done so.
Looks like one of the villains for the Hawkeye show will be the Clown first appearing in Hawkeye #9 (vol. 4). One panel cameo in issue #9 and Hawkeye #10 for the first full appearance. (His wilkpedia will say #8 but he is not in that book at all.)