Require directions to follow (6)
I believe the answer is:
entail
'require' is the definition.
(I've seen this in another clue)
'directions to follow' is the wordplay.
'directions' becomes 'en' (I've seen this in other clues).
'to follow' becomes 'tail' (both can mean to chase or pursue).
'en'+'tail'='ENTAIL'
(Other definitions for entail that I've seen before include "Call for" , "Involve or make necessary" , "Bring on, involve" , "legal restriction" , "Cut" .)