In parts see a part apart (8)
I believe the answer is:
separate
'in parts' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'see a part apart' is the wordplay.
'apart' indicates an anagram (the word is broken apart).
'see'+'a'+'part'='seeapart'
'seeapart' with letters rearranged gives 'SEPARATE'.
Can you help me to learn more?
(Other definitions for separate that I've seen before include "Move" , "divorce" , "Take or keep apart" , "Divided or detached" , "Divide, keep apart" .)