A despicable person gets put away in stir (7)
I believe the answer is:
agitate
'stir' is the definition.
(synonyms)
'a despicable person gets put away' is the wordplay.
'despicable person' becomes 'git' (I can't justify this - if you can you should believe this answer much more).
'gets' means one lot of letters go next to another.
'put away' becomes 'ate' (I've seen this in other clues).
'a'+'git'+'ate'='AGITATE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for agitate that I've seen before include "Upset, disturb the surface of" , "Get upset" , "Upset, stir" , "Incite" , "Disturb or stir up" .)