Neglect to mix gin with a mineral (6)
I believe the answer is:
ignore
'neglect' is the definition.
(neglect can mean to ignore)
'mix gin with a mineral' is the wordplay.
'mix' indicates anagramming the letters.
'with' says to put letters next to each other.
'a mineral' becomes 'ore' (ore is a kind of mineral).
'gin' is an anagram of 'ign'.
'ign'+'ore'='IGNORE'
'to' is the link.
(Other definitions for ignore that I've seen before include "Spurn" , "Brush off" , "Intentionally disregard" , "Turn a blind eye to" , "Pass over" .)