Don't fail to follow (7)
I believe the answer is:
succeed
This might be a double definition.
'don't fail' is the first definition.
'succeed' can be an answer for 'fail' (thesaurus). I am not sure about the 'don't' bit.
'to follow' is the second definition.
('succeed' can be a synonym of 'follow')
Can you help me to learn more?
(Other definitions for succeed that I've seen before include "Follow - triumph" , "Achieve one's ambitions" , "Follow in order" , "Attain ambition" , "accomplish aim" .)