Poisonous rotisserie fuel spilled (8)

I believe the answer is:

spiteful

I'm a little stuck... Click here to teach me more about this clue!

'poisonous' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'rotisserie fuel spilled' is the wordplay.
'rotisserie' becomes 'spit' (I've seen this before).
'spilled' is an anagram indicator.
'fuel' is an anagram of 'eful'.
'spit'+'eful'='SPITEFUL'

Can you help me to learn more?

(Other definitions for spiteful that I've seen before include "Malevolent, wanting to hurt" , "Showing malice" , "Catty" , "Vindictive - malicious" , "nasty!" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app