Crossword Genius

Mostly mischievous war parties (5)

Ross

I believe the answer is:

impis

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'war parties' is the definition.
The definition suggests a plural noun which matches the answer.

'mostly mischievous' is the wordplay.
'mostly' means to remove the last letter.
'mischievous' becomes 'impish' (synonyms).
'impish' with its last letter removed is 'IMPIS'.

Can you help me to learn more?

(Another definition for impis that I've seen is " Native warriors".)

I've seen this clue in The Telegraph.
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