Young people today go to Magaluf at last (4)
I believe the answer is:
yoof
'young people' is the definition.
(I know that youth can be expressed informally as yoof)
'today go to magaluf at last' is the wordplay.
'at last' suggests the final letters.
The last letters of 'today go to magaluf' are 'YOOF'.
(Other definitions for yoof that I've seen before include "Juveniles" , "Youngsters" , "Young people humorously" , "Teenagers" .)