Lads giving a wild shout with ultimate joy (6)
I believe the answer is:
youths
'lads' is the definition.
(I've seen this before)
'a wild shout with ultimate joy' is the wordplay.
'a wild' is an anagram indicator.
'with' says to put letters next to each other.
'ultimate' says to take the final letters.
The last letter of 'joy' is 'y'.
'shout' anagrammed gives 'ouths'.
'ouths' put after 'y' is 'YOUTHS'.
'giving' acts as a link.
(Other definitions for youths that I've seen before include "lads" , "Males between childhood and maturity" , "kids" , "juveniles" , "Adolescents" .)