14 across
Send
explicit
message
to
gent
regularly
seen
in
musical
group
(6)
Send explicit message to gent regularly seen in musical group (6)
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The definition is at the end of the clue.
How the clue works
Musical group is your definition. SEXT (to send an explicit message) comes first, then take the regularly-spaced — that is, even-positioned — letters of gent, which gives you ET, and put them together to get SEXTET.