For example, hurling up some limestone, magma, etc (4,4)

I believe the answer is:

team game

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'for example hurling' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'up some limestone magma etc' is the wordplay.
'up' is a reversal indicator (in down clue: letters go upwards).
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'emagmaet' can be found hidden inside 'limestone magma etc'.
'emagmaet' in reverse letter order is 'TEAM GAME'.

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I've seen this clue in The Times.

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