Nice actor prepared for additional part (9)
I believe the answer is:
accretion
'additional part' is the definition.
'accretion' can be an answer for 'part' (I have seen 'extra part' mean 'accretion' so perhaps 'part' could also mean 'accretion'). I am not sure about the 'additional' bit.
'nice actor prepared' is the wordplay.
'prepared' indicates an anagram.
'nice'+'actor'='niceactor'
'niceactor' anagrammed gives 'ACCRETION'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for accretion that I've seen before include "Gradual growth, increase" , "Something added" , "Extra amount" , "extra part" .)