Broadcast, untrue, about right nourishment (7)
I believe the answer is:
nurture
'nourishment' is the definition.
(I've seen this before)
'broadcast untrue about right' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'about' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'untrue' with letters rearranged gives 'nurtue'.
'nurtue' placed around 'r' is 'NURTURE'.
(Other definitions for nurture that I've seen before include "Feed - support" , "Sustain" , "Rue runt involved in process of rearing" , "Care for and protect" , "Supply sustenance to" .)