News about youth ultimately designed to cheer (7)
I believe the answer is:
gladden
'cheer' is the definition.
(thesaurus)
'news about youth ultimately designed' is the wordplay.
'news' becomes 'gen'.
'about' is an insertion indicator.
'youth' becomes 'lad' (I've seen this before**).
'ultimately' indicates one should take the final letters.
The final letter of 'designed' is 'd'.
'lad'+'d'='ladd'
'gen' placed around 'ladd' is 'GLADDEN'.
'to' is the link.
(Other definitions for gladden that I've seen before include "Delight" , "Make joyful" , "Hearten" , "Give pleasure to" , "Lift (the heart)" .)