Overlook the mixture of gin with mineral (6)
I believe the answer is:
ignore
'overlook' is the definition.
(I've seen this before)
'the mixture of gin with mineral' is the wordplay.
'the mixture of' is an anagram indicator (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'mineral' becomes 'ore' (ore is a kind of mineral).
'gin' is an anagram of 'ign'.
'ign'+'ore'='IGNORE'
(Other definitions for ignore that I've seen before include "Forget" , "Disregard - cut" , "Pass over" , "Fail to consider" , "Turn a blind eye to" .)