Setback for the French, about to broadcast several programmes (6)
I believe the answer is:
serial
'several programmes' is the definition.
(a serial is a series of programmes)
'setback for the french about to broadcast' is the wordplay.
'setback for' is a reversal indicator (letters are set down in backwards order).
'the french' becomes 'les' (plural form of 'the' in French).
'about' means one lot of letters goes inside another.
'to broadcast' becomes 'air' (to air on TV).
'les' enclosing 'air' is 'laires'.
'laires' backwards is 'SERIAL'.
(Other definitions for serial that I've seen before include "Episodic story from Israel" , "Publication in instalments" , "following a characteristic pattern" , "Program that's often on" , "Soap opera, e.g." .)