It may help in crime scene reconstruction (12)

I believe the answer is:

reminiscence

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'it may help' is the definition.
The definition suggests a singular noun which matches the answer.

'in crime scene reconstruction' is the wordplay.
'reconstruction' indicates anagramming the letters (I've seen 'reconstructions' mean this).
'in'+'crime'+'scene'='incrimescene'
'incrimescene' with letters rearranged gives 'REMINISCENCE'.

Can you help me to learn more?

(Other definitions for reminiscence that I've seen before include "Recall of past times" , "Enjoyable recollection" , "It recalls happenings" , "Memoir" , "Memory" .)

I've seen this clue in The Guardian and The Globe and Mail.

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