Get rid of one’s vehicle - being collected by daughters (7)
I believe the answer is:
discard
'get rid of' is the definition.
(discarding is a kind of getting rid of)
'one's vehicle being collected by daughters' is the wordplay.
'one's' becomes 'is' (Roman numeral).
'vehicle' becomes 'card' (I can't explain this - if you can you should give a lot more credence to this answer).
'being collected by' says to put letters next to each other (I've seen this in other clues).
'daughters' becomes 'd'.
'is'+'card'='iscard'
'iscard' put after 'd' is 'DISCARD'.
Can you help me to learn more?
(Other definitions for discard that I've seen before include "Abandon" , "Shed" , "Get rid of" , "Reject" , "Throw away or cast off" .)