Deceptively simple forces (6)
I believe the answer is:
impels
'forces' is the definition.
('impel' can be a synonym of 'force')
'deceptively simple' is the wordplay.
'deceptively' is an anagram indicator (I've seen this in other clues).
'simple' with letters rearranged gives 'IMPELS'.
(Other definitions for impels that I've seen before include "Urges forward" , "Drives on in simple way" , "Forces, urges to action" , "Spurs" , "Urges or drives to do something" .)