6 down
1
tip
to
stop
festival
succeeded
(10)
1 tip to stop festival succeeded (10)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition here is 1 — that's a cross-reference to 1 down, whose answer is SOAP, and EastEnders is of course a TV soap opera. For the wordplay, take the festival EASTER and insert END (a "tip" to stop) inside it to get EASTENDER, then stick S on the end for succeeded.