Regularly thump ram (3)

I believe the answer is:

tup

'ram' is the definition.
(both can mean a male sheep)

'regularly thump' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'thump' are 'TUP'.

(Other definitions for tup that I've seen before include "sheep" , "Sheepish male" , "Ram" .)

I've seen this clue in The Telegraph.

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