Swears about one form of therapy in forces (7)
I believe the answer is:
effects
'forces' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for effects that I've seen before include "one's luggage" , "They follow causes" , "Results - or properties" , "paraphernalia" , "They always have causes" .)