21 across
Form
of
comic,
Mark,
with
one
short
joke
(5)
Form of comic, Mark, with one short joke (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Form of comic, since manga is a style of Japanese comic. The wordplay builds M (abbreviation for Mark, the currency) + AN (one) + GA (the joke GAG shortened by dropping its last letter), giving MANGA.