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Evenin' all. One clue puzzles me today:
"Foreign rock I found in unusual crater" = 'erratic'. Anagram of I/crater but what's this 'foreign rock' nonsense?
Many thanks.

This one was new for me as well. The Gospel according to St Chamber's says:

erratic: noun
a wanderer
an erratic block or boulder

erratic block or erratic boulder: noun
a mass of rock transported by ice and deposited at a distance

Chamber's is used as a source by a large number of crossword setters (that's the big version, not the smaller one that is also available free online)

Thanks Dave. Out of curiosity, how big is the big version? In inches...

Approx. 11 x 7.5 x 2.5

Accept no substitute, as they say. You also get 6 months free subscription to the full online version when you buy the hardback. £16.09 post free in the UK from Amazon (list price £25):

http://www.amazon.co.uk/Chambers-Dictionary/dp/0550102892/ref=sr_1_1?ie=UTF8&s=books&qid=1237848900&sr=8-1