Sons pick extremely funny person (6)

I believe the answer is:

scream

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'funny person' is the definition.
(I've seen this before)

'sons pick' is the wordplay.
'sons' becomes 's'.
'pick' becomes 'cream' (synonyms).
's'+'cream'='SCREAM'

'extremely' acts as a link.
This may not be correct. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for scream that I've seen before include "Extremely funny entertainer" , "cry loudly" , "Assault victim's reaction, possibly" , "Caution" , "'Loud, high-pitched cry (6)'" .)

I've seen this clue in The Sun and The Times.

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