Young people - some keep them in or suffer (6)
I believe the answer is:
minors
'young people' is the definition.
(I've seen this before)
'some keep them in or suffer' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'MINORS' is hidden in the letters of 'keep them in or suffer'.
(Other definitions for minors that I've seen before include "could be little ones" , "Young people" , "They're too young to vote" , "They are legally under-age" , "They're under-age" .)