Corporation terrorising union members, originally (3)

I believe the answer is:

tum

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

'terrorising union members originally' is the wordplay.
'originally' says to take the initial letters.
The first letters of 'terrorising union members' is 'TUM'.

(Other definitions for tum that I've seen before include "Corporation" , "Belly" , "Stomach (informal)" , "Middle" .)

I've seen this clue in The Times.

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