Look agreeable, but to no good end (3)
I believe the answer is:
nod
'look' is the definition.
(thesaurus)
'no good end' is the wordplay.
'end' indicates one should take the final letters.
The final letter of 'good' is 'd'.
'no'+'d'='NOD'
'agreeable but to' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for nod that I've seen before include "Doze" , "Agree non-verbally" , "Signify agreement" , "Incline the head" , "overlook something" .)