Animals rush back (4)

I believe the answer is:

deer

'animals' is the definition.

'rush back' is the wordplay.
'rush' becomes 'reed' (I've seen this before).
'back' shows that the letters should be reversed in order.
'reed' backwards is 'DEER'.

(Other definitions for deer that I've seen before include "Hoofed grazing animal" , "Eg, stag or doe" , "Like a power switch" , "Antler-bearing animal" , "See 23" .)

I've seen this clue in The Telegraph.

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