French who sleep I largely call confused (9)

I believe the answer is:

quizzical

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'confused' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I don't see?

'french who sleep i largely call' is the wordplay.
'french who' becomes 'qui'.
'sleep' becomes 'zz'.
'largely' means to remove the last letter.
'call' with its last letter removed is 'cal'.
'qui'+'zz'+'i'+'cal'='QUIZZICAL'

Can you help me to learn more?

(Other definitions for quizzical that I've seen before include "Curious" , "Mildly perplexed" , "Questioning, look say" , "Mocking; perplexed" , "Questioning - teasing" .)

I've seen this clue in The Guardian.

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