19 down
Relax
on
firm
topper
on
mattress
for
programme
(6)
Relax on firm topper on mattress for programme (6)
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The definition is at the end of the clue.
How the clue works
Right, so programme at the end is your definition — a TV sitcom. For the wordplay, start with SIT for "relax", then bolt on CO for "firm" (as in company), and finish with M, the topper (first letter) of "mattress" — string those together and you're there.