Mother is wise to get therapy (7)
I believe the answer is:
massage
'therapy' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'mother is wise' is the wordplay.
'mother' becomes 'mas' (I can't explain this - if you can you should give a lot more credence to this answer).
'is wise' becomes 'sage' (similar in meaning).
'mas'+'sage'='MASSAGE'
'to get' is the link.
Can you help me to learn more?
(Other definitions for massage that I've seen before include "Present favourably" , "Manipulate to get better results" , "therapeutic treatment" , "Knead" , "Manipulate the muscles" .)