South London suburb falling out of line (4)
I believe the answer is:
skew
'falling out of line' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
'south london suburb' is the wordplay.
'south' becomes 'S' (abbreviation).
'london suburb' becomes 'kew' (I've seen this in another clue).
's'+'kew'='SKEW'
Can you help me to learn more?
(Other definitions for skew that I've seen before include "Make biased or distorted" , "Oblique; distort" , "Oblique, make crooked" , "Not symmetrical" , "Colour" .)