One crashed in mid-March? (3)
I believe the answer is:
car
'mid-march?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'one crashed in' is the wordplay.
'one' becomes 'a' (a thing is one thing).
'crashed' becomes 'cr' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'a' inserted within 'cr' is 'CAR'.
Can you help me to learn more?
(Other definitions for car that I've seen before include "Wheeled vehicle" , "Personal vehicle" , "Vehicle carrying vehicles" , "Hatchback, say?" , "Motor vehicle" .)