Crossword Genius

Thermos designed for some parents (7)

Ross

I believe the answer is:

mothers

'some parents' is the definition.
(mother is a kind of parent)

'thermos designed' is the wordplay.
'designed' is an anagram indicator (designed with the letters).
'thermos' anagrammed gives 'MOTHERS'.

'for' acts as a link.

(Other definitions for mothers that I've seen before include "Parents" , "Dams" , "Fusses over" .)

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