Crossword Genius

Mother's broken the flask (7)

Ross

I believe the answer is:

thermos

'flask' is the definition.
(I know that thermos is a type of vacuum bottle)

'mother's broken' is the wordplay.
'broken' indicates an anagram.
'mothers' with letters rearranged gives 'THERMOS'.

'the' acts as a link.

(Other definitions for thermos that I've seen before include "Heat-retaining flask for mothers" , "Vacuum flask for mothers" , "Container to retain heat" , "Flask trade mark" .)

I've seen this clue in The Globe and Mail.
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