Call for dog to follow directions (6)
I believe the answer is:
entail
'call for' is the definition.
(entail can mean to call for or require)
'dog to follow directions' is the wordplay.
'dog' becomes 'tail' (synonyms).
'to follow' means one lot of letters go next to another (some letters go after or follow others).
'directions' becomes 'en' (east and north).
'tail' after 'en' is 'ENTAIL'.
(Other definitions for entail that I've seen before include "Involve or require" , "Invlove or necessitate" , "Need" , "Restriction on inheritance" , "Estate settled" .)