Rotten PM no good after training (9)
I believe the answer is:
perishing
'rotten pm no good after training' is the definition.
Although both the answer and definition are present participle verbs, I cannot understand how one could define the other.
'pm no good after training' is the wordplay.
'pm' becomes 'rishi' (I can't justify this - if you can you should believe this answer much more).
'no good' becomes 'ng' (abbreviation).
'after' says to put letters next to each other.
'training' becomes 'PE' (Physical Education).
'rishi'+'ng'='rishing'
'rishing' put after 'pe' is 'PERISHING'.
Can you help me to learn more?
(Other definitions for perishing that I've seen before include "Dying" , "going west" .)