Indicator of sarcasm is terrible to a squire (3,6)
I believe the answer is:
air quotes
'indicator of sarcasm' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'terrible to a squire' is the wordplay.
'terrible' indicates an anagram.
'to'+'a'+'squire'='toasquire'
'toasquire' with letters rearranged gives 'AIR QUOTES'.
'is' is the link.
Can you help me to learn more?
I've seen this clue in The Times.
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