Rod back with little thing in Warren (6)

I believe the answer is:

rabbit

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

'thing in warren' is the definition.
'rabbit' can be an answer for 'warren' (synonyms). I am not sure about the 'thing in' bit.

'rod back with little' is the wordplay.
'rod' becomes 'bar' (I've seen this before).
'back' shows that the letters should be reversed in order.
'with little' becomes 'bit' (I've seen this in another clue. I am not sure about the 'with' bit.).
'bar' written backwards gives 'rab'.
'rab'+'bit'='RABBIT'

Can you help me to learn more?

(Other definitions for rabbit that I've seen before include "Weak player" , "Chatter; mammal" , "Long-eared burrowing animal" , "8's friend with relations" , "may be pulled out of Derby, perhaps" .)

I've seen this clue in the Sydney Morning Herald.

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