Understand and obey the instructions (6)
I believe the answer is:
follow
This might be a double definition.
'understand' is the first definition.
(thesaurus)
'obey the instructions' is the second definition.
'follow' can be an answer for 'obey' (following is a kind of obeying). I'm not sure about the 'the instructions' bit.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for follow that I've seen before include "'____ and don't dilly-dally on the way'" , "Go along (a route)" , "Come next" , "Succeed; go after" , "Go or come after" .)