Crossword Genius

Betray one's principles in very popular show (4-3)

Ross

I believe the answer is:

sell-out

I believe this is a double definition.

'betray one's principles' is the first definition.
(I've seen this before)

'very popular show' is the second definition.
(a sell-out show is very popular)

'in' is the link.

(Other definitions for sell-out that I've seen before include "successful show" , "Betrayal" , "When all tickets are booked in advance" , "Event with no further ticket availability" .)

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