One filling up catheter following treatment having beneficial effect (11)

I believe the answer is:

therapeutic

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'having beneficial effect' is the definition.
I can't judge whether this definition defines the answer.

'one filling up catheter following treatment' is the wordplay.
'one' becomes 'i' (Roman numeral).
'filling' means one lot of letters goes inside another.
'following treatment' indicates anagramming the letters.
'up'+'catheter'='upcatheter'
'upcatheter' anagrammed gives 'therapeutc'.
'i' going inside 'therapeutc' is 'THERAPEUTIC'.

Can you help me to learn more?

(Other definitions for therapeutic that I've seen before include "Related to healing" , "having a good effect" , "Contributing to good health" , "Contributing to good heath" , "Sanative" .)

I've seen this clue in The Times.

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