Some colliers are buried (3)

I believe the answer is:

lie

'are buried' is the definition.
(to lie can mean to be buried)

'some colliers' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'LIE' is hidden within 'colliers'.

(Other definitions for lie that I've seen before include "Perjure" , "Tell untruths" , "Recline - untruth" , "Pork pie" , "Stretch out" .)

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

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