Clue: Endless show of warmth: hasten round to shelter from the cold (5)
Answer: IGLOO
Explanation: Definition: shelter from the cold
I'm not sure about this: I think it's GLO[w] in (sheltered by) the reverse of OI (interjection, could mean "hurry up"), but then "shelter" does double duty as part of the definition. Any better ideas? *Thanks to several commenters: the glo[w] "has ten" (IO) round it.