Crossword Genius

Complex mix of simple forces (6)

Ross

I believe the answer is:

impels

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

'forces' is the definition.
('impel' can be a synonym of 'force')

'complex mix of simple' is the wordplay.
'simple' anagrams to 'IMPELS'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for impels that I've seen before include "Urges or drives to do something" , "Forces, urges to action" , "Drives or forces" , "Spurs" , "Drives on in simple way" .)

I've seen this clue in The Sunday Times.
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