Unstraps a little sarong shifting in warm spots (8)

I believe the answer is:

suntraps

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'spots' is the definition.
(I have seen 'hot spots' mean 'suntraps' so perhaps 'spots' could also mean 'suntraps')

'unstraps a little sarong shifting in warm' is the wordplay.
'unstraps' can be anagrammed to 'SUNTRAPS'.
However, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for suntraps that I've seen before include "hot spots" , "Solar snares in gardens" .)

I've seen this clue in The Everyman puzzle in The Observer.

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