Crossword Genius

Fool concerning explosive ingredient (5)

Ross

I believe the answer is:

nitre

'explosive ingredient' is the definition.
(I've seen this before)

'fool concerning' is the wordplay.
'fool' becomes 'nit' (both can mean a stupid person).
'concerning' becomes 're' (both can mean on a particular topic).
'nit'+'re'='NITRE'

(Other definitions for nitre that I've seen before include "Salt" , "Chemical" , "explosive ingredient" , "food preservative" , "Sodium nitrate" .)

I've seen this clue in The Mirror and The Daily Express.
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