Might go with head of state for a little drink and informal chat (6)
I believe the answer is:
gossip
'informal chat' is the definition.
'gossip' can be an answer for 'chat' (gossip is a kind of chat). I am not sure about the 'informal' bit.
'might go with head of state for a little drink' is the wordplay.
'might' indicates an anagram (I've seen this in other clues).
'with' says to put letters next to each other.
'head of' indicates taking the first letters.
'for' says to put letters next to each other.
'a little drink' becomes 'sip' (I've seen this in another clue).
The initial letter of 'state' is 's'.
'go' put after 's' is 'sgo'.
'sgo' anagrammed gives 'gos'.
'gos'+'sip'='GOSSIP'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for gossip that I've seen before include "creating scandal" , "gas" , "Busybody" , "Chin-wag, chit-chat" , "Natter" .)