17 across
Marshal,
atishoo’s
just
under
way
–
bless
me,
silly!
(8)
Marshal, atishoo’s just under way – bless me, silly! (8)
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The definition is at the beginning of the clue.
How the clue works
The definition is Marshal, meaning to gather or assemble things together. You take the first letter of "atishoo" (so, A), then "bless me" is the anagram fodder with "silly" telling you to jumble it up, giving you SSEMBLE — stick them together and there's your answer.