Follow, as advice (5)
(Other definitions for acton that I've seen before include "English statesman" , "Part of the London borough of Ealing - British historian, d. 1902" , "District of West London" , "London area" , "somewhere in London" .)
'follow as advice' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for heed that I've seen before include "Listen to carefully" , "Regard" , "Be mindful of" , "Care, attention (paid)" , "Consider" .)
(Another definition for adhere to that I've seen is " Abide by".)