I also corrected poor actor's display of misery (9,5)
I believe the answer is:
crocodile tears
'actor's display of misery' is the definition.
I can't judge whether this definition defines the answer.
'i also corrected poor' is the wordplay.
'poor' indicates anagramming the letters.
'i'+'also'+'corrected'='ialsocorrected'
'ialsocorrected' is an anagram of 'CROCODILE TEARS'.
Can you help me to learn more?
(Other definitions for crocodile tears that I've seen before include "these are shed" , "no real show of pity" , "sign of insincerity" , "Insincere show of sorrow" , "false signs of sympathy" .)