Crossword Genius

Rarely at rest, in haste avoiding warm-up? (4-9)

Ross

I believe the answer is:

heat-resistant

'avoiding warm-up?' is the definition.
(avoiding heating up)

'rarely at rest in haste' is the wordplay.
'rarely' is an anagram indicator (rare can mean unusual or strange).
'at'+'rest'+'in'+'haste'='atrestinhaste'
'atrestinhaste' anagrammed gives 'HEAT-RESISTANT'.

I've seen this clue in The Times.
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