Parts of horses Sikh revolutionary brushes (6)
I believe the answer is:
kisses
'brushes' is the definition.
('kiss' can be a synonym of 'brush')
'parts of horses sikh revolutionary' is the wordplay.
'parts' indicates the answer is hidden within the clue (I've seen 'part of' mean this).
'revolutionary' says the letters should be written in reverse (letters revolve around).
'sessik' is hidden within 'of horses sikh'.
'sessik' written backwards gives 'KISSES'.
(Other definitions for kisses that I've seen before include "Lightly touches" , "Osculates" , "Smackers" , "Light touches" , "caresses" .)