Vehicle with alternating jets is a nice touch (6)
I believe the answer is:
caress
'a nice touch' is the definition.
(I've seen this in another clue)
'vehicle with alternating jets' is the wordplay.
'vehicle' becomes 'car' (car is a kind of vehicle).
'with alternating jets' becomes 'ess' (I can't justify this - if you can you should give a lot more credence to this answer).
'car'+'ess'='CARESS'
'is' is the link.
Can you help me to learn more?
(Other definitions for caress that I've seen before include "pet" , "Stroke affectionately" , "Scares into handle lovingly" , "Stoke affectionately" , "Tenderly stroke" .)