Last thing a crowd will do? (8)
I believe the answer is:
disperse
'do?' 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?
'last thing a crowd' is the wordplay.
I cannot really understand how this works, but
'a' could be 'per' (eg 'one a day' means 'one per day') and 'per' is found in the answer.
'crowd' could be 'd' and 'd' is present in the answer.
This explanation may well be incorrect...
'will' is the link.
Can you help me to learn more?
(Other definitions for disperse that I've seen before include "'Break up, spread out (8)'" , "Break up, move away from each other" , "Presides so as to scatter" , "Thin out and disappear" , "Scatter in all directions" .)