Aim to slip lead in cordial (8)
I believe the answer is:
amicable
'cordial' is the definition.
(I've seen this before)
'aim to slip lead' is the wordplay.
'to slip' indicates anagramming the letters.
'lead' becomes 'cable' (I can't justify this - if you can you should give a lot more credence to this answer).
'aim' anagrammed gives 'ami'.
'ami'+'cable'='AMICABLE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for amicable that I've seen before include "not hostile" , "on good terms" , "warm" , "Friendly, nonthreatening" , "Male cab I change to, just to be friendly" .)