Crossword Genius

Set to spark off explosive material (9)

Ross

I believe the answer is:

gelignite

'explosive material' is the definition.
(I know that Gelignite is a explosive material)

'set to spark' is the wordplay.
'set' becomes 'gel' (both can mean to harden).
'to spark' becomes 'ignite' (I've seen this in another clue).
'gel'+'ignite'='GELIGNITE'

'off' is the link.

(Other definitions for gelignite that I've seen before include "(E.g. quarry) explosive" , "Tieing leg up in explosive" , "factor in altering mine?" , "source of flare-up" , "High explosive" .)

I've seen this clue in The Guardian.
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