Steal heart of acrobat (3)
I believe the answer is:
rob
'steal' is the definition.
(I know that rob is a more specific form of the action steal)
'heart of acrobat' is the wordplay.
'heart of' says the answer is hidden in the clue.
'ROB' can be found hidden inside 'acrobat'.
(Other definitions for rob that I've seen before include "Steal or purloin" , "Steal violently" , "Hold up" , "Nick" , "Burgle" .)