Leave suddenly in vehicle with one swish exterior (6)
I believe the answer is:
vanish
'leave suddenly in' is the definition.
I can't judge whether this definition defines the answer.
'vehicle with one swish exterior' is the wordplay.
'vehicle' becomes 'van' (type of vehicle).
'with' means one lot of letters go next to another.
'one' becomes 'i' (Roman numeral).
'exterior' suggests removing the centre.
'swish' with its middle removed is 'sh'.
'van'+'i'+'sh'='VANISH'
Can you help me to learn more?
(Other definitions for vanish that I've seen before include "make go" , "Evanesce" , "Disappear or fade from sight" , "Cease to exist" , "Disappear without trace" .)