Crossword Genius

Second best part that's a laugh (6)

Ross

I believe the answer is:

scream

'that's a laugh' is the definition.
(scream is a kind of laugh)

'second best part' is the wordplay.
'second' becomes 's' (common abbreviation).
'best part' becomes 'cream' (I've seen this before).
's'+'cream'='SCREAM'

(Other definitions for scream that I've seen before include "'Sharp, piercing cry (6)'" , "comedian?" , "Assault victim's reaction, possibly" , "Funny person; cry" , "Hilarious character" .)

I've seen this clue in The Telegraph.
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