Stray carriers? (5)

I believe the answer is:

trays

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'carriers?' is the definition.
(I have seen 'Shallow carriers ' mean 'trays' so perhaps 'carriers' could also mean 'trays')

'stray' is the wordplay.
'stray' anagrams to 'TRAYS'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for trays that I've seen before include "Salvers" , "Shallow carriers" .)

I've seen this clue in the Evening Standard.

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