Roy is happy the characters are changing treatment (13)

I believe the answer is:

physiotherapy

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'changing treatment' is the definition.
'physiotherapy' can be an answer for 'treatment' (physiotherapy is a kind of treatment). I'm not sure about the 'changing' bit.

'roy is happy the characters' is the wordplay.
'characters' indicates an anagram.
'roy'+'is'+'happy'+'the'='royishappythe'
'royishappythe' is an anagram of 'PHYSIOTHERAPY'.

'are' is the link.

Can you help me to learn more?

(Other definitions for physiotherapy that I've seen before include "Treatment of illness or injury using massage, exercise etc" , "Manipulative medical treatment" .)

I've seen this clue in The Irish Independent.

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