Prepared for race, perhaps with a shortage of time, and fell down (6)

I believe the answer is:

rained

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'fell down' is the definition.
'rained' can be an answer for 'fell' (raining is a kind of falling). I'm not certain of the 'down' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rained that I've seen before include "Precipitated moisture from sky" , "Poured" , "showered" .)

I've seen this clue in The Hindu.

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