It's a cryptic definition, ie. a definition only clue in which part of the
definition is obscured by a pun or other piece of wordplay. The straight
definition is ...
having an appearance or manner that is appealing on television
... so the cryptic definition disguises 'on television' behind 'in set
pieces' leaving it to the solver to recognise the pun and reconstruct the
As I said, this is a poor example of the technique which is in any case
somewhat controversial, to the extent that it is forbidden in American
cryptics. The classic example from the past is ...
A wicked thing (6)
.... though that would be considered somewhat unsophisticated by modern
standards. Other examples would be ....
Event for which one is late (7)
The growth of the fairy tale (9)
A letter for Socrates (5)
Give them a go and see if the penny drops, on which note ....
A fall in realised assets (3,5,5)