Complex mix of simple forces (6)
I believe the answer is:
impels
'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" .)