Shout for second best (6)
I believe the answer is:
scream
'shout' is the definition.
(screaming is a kind of shouting)
'second best' is the wordplay.
'second' becomes 's' (common abbreviation).
'best' becomes 'cream' (both can mean the elite).
's'+'cream'='SCREAM'
'for' acts as a link.
(Other definitions for scream that I've seen before include "irresistibly funny person" , "Funny person; cry" , "A shrill yell as from fright" , "'Loud, high-pitched cry (6)'" , "Caution" .)