Disorganised parties make slatternly progress (7)
I believe the answer is:
traipse
'slatternly progress' is the definition.
The answer and definition can be both to do with motion as well as being verbs in their base form.
Maybe you can see an association between them that I can't see?
'disorganised parties' is the wordplay.
'disorganised' indicates an anagram.
'parties' anagrammed gives 'TRAIPSE'.
'make' is the link.
Can you help me to learn more?
(Other definitions for traipse that I've seen before include "Walk about wearily" , "travel wearily" , "Walk heavily" , "Trudge around" , "laborious walk" .)