Like bird’s behind (6)

I believe the answer is:

astern

'behind' is the definition.
(I've seen this before)

'like bird's' is the wordplay.
'like' becomes 'as'.
'bird' becomes 'tern' (tern is a kind of bird).
'as'+'tern'='ASTERN'

(Other definitions for astern that I've seen before include "Aft" , "Behind (naut.)" , "Rearward" , "Towards rear of a vessel" , "Towards the rear of a ship" .)

I've seen this clue in The Telegraph and The Hindu.

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