Barrier in Ganges’ extremes has chalices (6)
I believe the answer is:
grails
'chalices' is the definition.
(grail is a kind of chalice)
'barrier in ganges' extremes' is the wordplay.
'barrier' becomes 'rail' (rail is a kind of barrier).
'in' is an insertion indicator.
'extremes' suggests removing the centre.
'ganges' with its centre taken out is 'gs'.
'rail' going into 'gs' is 'GRAILS'.
'has' acts as a link.
I've seen this clue in The Hindu.
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