Old timers wandering US island (8)

I believe the answer is:

sundials

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'old timers' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'wandering us island' is the wordplay.
'wandering' is an anagram indicator.
'us'+'island'='usisland'
'usisland' anagrammed gives 'SUNDIALS'.

Can you help me to learn more?

(Other definitions for sundials that I've seen before include "They tell the time when there's no cloud" , "Daylight timekeepers" .)

I've seen this clue in the Sydney Morning Herald.

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