Sabotage beneath pit (9)

I believe the answer is:

undermine

'sabotage' is the definition.
(I know that sabotage can be written as undermine)

'beneath pit' is the wordplay.
'beneath' becomes 'under' (under means beneath or underneath).
'pit' becomes 'mine' (mining pit).
'under'+'mine'='UNDERMINE'

(Other definitions for undermine that I've seen before include "Erode foundations" , "Erode the base or foundation of" , "Weaken, sap" , "Subvert or weaken gradually" , "Weaken insidiously" .)

I've seen this clue in The Daily Express.

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