Engineers make call that's therapeutic (8)
I believe the answer is:
remedial
'that's therapeutic' is the definition.
(synonyms)
'engineers make call' is the wordplay.
'engineers' becomes 'reme' (I've seen this in other clues).
'make call' becomes 'dial' (I am not sure about this - if you are sure you should believe this answer much more).
'reme'+'dial'='REMEDIAL'
Can you help me to learn more?
(Other definitions for remedial that I've seen before include "Putting things right" , "palliative" , "Providing a cure or treatment for illness or deficiency" , "Designed to be therapeutic" , "I'm leader of curative sort" .)