Not born yesterday? On the contrary (3-3)
I believe the answer is:
day-old
'not born yesterday? on the contrary' is the definition.
I know nothing about this answer so I can't judge whether this works.
'not born yesterday? on the contrary' is the subsidiary indication.
'not' suggests deleting specific letters.
'born' becomes 'n'.
'yesterday?' becomes 'day' (yesterday is a kind of day).
'the contrary' becomes 'ld' (I can't justify this - if you can you should believe this answer much more).
'day'+'on'='dayon'
'dayon' with 'n' taken away is 'dayo'.
'dayo'+'ld'='dayold'
I've seen this clue in The Guardian.
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