DNA removed from Icelandic spike that's frozen (6)
I believe the answer is:
icicle
'that's frozen' is the definition.
I can't judge whether this definition defines the answer.
'dna removed from icelandic spike' is the wordplay.
'removed from' indicates named letters should be taken away.
'spike' indicates an anagram (I've seen 'spiked' mean this (spiked suggests violence or disruption)).
'icelandic' with 'dna' taken away is 'icelic'.
'icelic' with letters rearranged gives 'ICICLE'.
Can you help me to learn more?
(Other definitions for icicle that I've seen before include "Hanging piece of frozen water" , "Hanging ice spike" , "Hanging drop of cold water" , "Something tapering, seen in freezing weather" , "Frozen water drops" .)