Heads of international committee indicted lying youth without feeling (5)
I believe the answer is:
icily
'without feeling' is the definition.
(icy can mean unfeeling or cold)
'heads of international committee indicted lying youth' is the wordplay.
'heads of' indicates taking the first letters.
'youth' becomes 'y'.
The initial letters of 'international committee indicted lying' is 'icil'.
'icil'+'y'='ICILY'
(Other definitions for icily that I've seen before include "In a cold manner" , "Without feeling" , "In a cool manner" , "In a frosty manner" , "Coldly" .)