Very good to think about flu treatment (9)

I believe the answer is:

wonderful

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'very good' is the definition.
'wonderful' can be an answer for 'good' (thesaurus). I am not sure about the 'very' bit.

'think about flu treatment' is the wordplay.
'think about' becomes 'wonder' (to wonder about something is to contemplate it).
'treatment' indicates anagramming the letters (letters treated or processed differently).
'flu' with letters rearranged gives 'ful'.
'wonder'+'ful'='WONDERFUL'

'to' is the link.

Can you help me to learn more?

(Other definitions for wonderful that I've seen before include "Fab" , "Superb" , "Excellent" , "Awe-inspiring" , "Remarkably good" .)

I've seen this clue in The Daily Express.

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