Heading for the frozen wastes or stuck in them (8)
I believe the answer is:
icebound
'wastes or stuck in them' is the definition.
I can't tell whether this definition defines the answer.
'heading for the frozen' is the wordplay.
'heading' becomes 'bound' (I am not sure about this - if you are sure you should believe this answer much more).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the frozen' becomes 'ice' (I've seen this in other clues).
'bound' put after 'ice' is 'ICEBOUND'.
Can you help me to learn more?
(Other definitions for icebound that I've seen before include "(Arctic ship) stuck for winter" , "Like ships trapped near poles" , "Locked in by frozen water" , "trapped by wintry conditions" , "(Of ship) trapped by frozen water" .)