15 across
First
couple
of
letters
dispatched,
so
not
here
(6)
First couple of letters dispatched, so not here (6)
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The definition is at the end of the clue.
How the clue works
Look at so not here — that's your definition. For the wordplay, "first couple of letters" gives you AB (the first two letters of the alphabet), and then dispatched gives you SENT, and you just stick them together.