Engine doesn't start in wet weather (4)
I believe the answer is:
rain
'wet weather' is the definition.
(rain is wet weather)
'engine doesn't start in' is the wordplay.
I cannot quite understand how this works, but
'in' is present in the answer.
The remaining letters 'ra' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for rain that I've seen before include "See 12" , "Falling moisture" , "downfall?" , "Fall wetly" , "Precipitation" .)