Keeps plough stationary (10)

I believe the answer is:

stockstill

'stationary' is the definition.

'keeps plough' is the wordplay.
'keeps' becomes 'stocks' (I've seen this before).
'plough' becomes 'till' (I've seen this before).
'stocks'+'till'='STOCKSTILL'

(Other definitions for stockstill that I've seen before include "like a statue" , "is not moving at all" , "Absolutely no movement" .)

I've seen this clue in The Guardian.

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