Everything screened by broadcaster is more jaundiced (8)

I believe the answer is:

sallower

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'more jaundiced' is the definition.
Both the definition and answer are comparative adjectives. Maybe they are linked in a way I don't understand?

'everything screened by broadcaster' is the wordplay.
'everything' becomes 'all' (all things).
'screened by' is an insertion indicator.
'broadcaster' becomes 'sower' (someone who broadcasts or sows seeds).
'all' placed inside 'sower' is 'SALLOWER'.

'is' is the link.

Can you help me to learn more?

(Another definition for sallower that I've seen is " Looking comparatively pale".)

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