Second search is an accident (5)

I believe the answer is:

shunt

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'an accident' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'second search' is the wordplay.
'second' becomes 's' (common abbreviation).
'search' becomes 'hunt' (synonyms).
's'+'hunt'='SHUNT'

'is' is the link.

Can you help me to learn more?

(Other definitions for shunt that I've seen before include "Sidetrack" , "Car crash (slang)" , "Transfer rolling stock from track to track" , "Move railway wagons etc" , "Motor collision" .)

I've seen this clue in The Daily Express.

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