Parasites preserved in primeval iceberg? (4)
I believe the answer is:
'parasites' is the definition.
(lice are parasitic insects)
'preserved in primeval iceberg?' is the wordplay.
'preserved in' indicates a hidden word.
'LICE' is hidden within 'primeval iceberg'.
(Other definitions for lice that I've seen before include "Parasitic insects" , "Crawlers" , "Bloodsucking insects" , "Wingless bloodsucking parasites" , "Bloodsucking parasitic insect" .)