Study language, having quintet in for chat (8)
I believe the answer is:
converse
'chat' is the definition.
(thesaurus)
'study language having quintet in' is the wordplay.
'study' becomes 'con' (I've seen this before).
'language' becomes 'erse' (Erse is an example).
'having' says to put letters next to each other.
'quintet' becomes 'v' ('V' can be a synonym of 'quintet').
'in' means one lot of letters goes inside another.
'con'+'erse'='conerse'
'conerse' enclosing 'v' is 'CONVERSE'.
'for' is the link.
(Other definitions for converse that I've seen before include "Turned round" , "discuss" , "Discourse" , "speak" , "Remain silent? No" .)