Youngsters writing about wrought iron (6)
I believe the answer is:
minors
'youngsters' is the definition.
('minor' can be a synonym of 'youngster')
'writing about wrought iron' is the wordplay.
'writing' becomes 'ms' (abbreviation for manuscript).
'about' indicates putting letters inside.
'wrought' is an anagram indicator (I've seen this in other clues).
'iron' with letters rearranged gives 'inor'.
'ms' enclosing 'inor' is 'MINORS'.
(Other definitions for minors that I've seen before include "They're under-age" , "could be little ones" , "They're too young to vote" , "They are legally under-age" , "Young people" .)