10 across
Communication
system
is
common
kind
for
Spooner
(5,4)
Communication system is common kind for Spooner (5,4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Communication system. For the wordplay, think of "coarse mode" — common kind — and hand it to Spooner, who swaps the opening consonants to give you "morse code".