Further tweaking involving impartial fellows badly rated externally (12)
I believe the answer is:
readjustment
'further tweaking' is the definition.
I can't judge whether this defines the answer.
'impartial fellows badly rated externally' is the wordplay.
'impartial' becomes 'just' (associated in meaning).
'fellows' becomes 'men' (fellow can mean a man).
'badly' is an anagram indicator (letters in the wrong order).
'externally' means one lot of letters goes inside another (some letters go on the outside of others).
'rated' is an anagram of 'readt'.
'just'+'men'='justmen'
'justmen' placed inside 'readt' is 'READJUSTMENT'.
'involving' acts as a link.
Can you help me to learn more?
(Other definitions for readjustment that I've seen before include "Further change needed!" , "adaptation" , "Additional tweak" , "compromise" , "another alteration" .)