Crossword Genius

Gimme reptile and no mistake (3-2)

Ross

I believe the answer is:

tap-in

I'm a little stuck... Click here to teach me more about this clue!

'gimme' is the definition.
(both can mean an easy shot eg in football)

I don't understand the remainder of the clue.

Can you help me to learn more?

I've seen this clue in The Independent.
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