Support rear end (4)

I believe the answer is:

back

I believe this clue is a double definition.

'support' is the first definition.
(back is a kind of support)

'rear end' is the second definition.
(thesaurus)

(Other definitions for back that I've seen before include "player in line of defence?" , "See 12" , "Support (from behind?)" , "See 17" , "bet" .)

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

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