23 across
Season
starter
of
nachos
–
garnish
with
bit
of
greenery
(6)
Season starter of nachos – garnish with bit of greenery (6)
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The definition is at the beginning of the clue.
How the clue works
The definition here is Season, meaning a time of year like the one after winter. You take SPRIG, which is a "bit of greenery", and tuck N — the first letter of "nachos" — inside it, as indicated by "garnish with", to get the answer.