Crossword Genius

Flask carried by brother, mostly (7)

Ross

I believe the answer is:

thermos

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

'carried by brother mostly' is the wordplay.
'carried by' indicates a hidden word.
'THERMOS' is hidden in the letters of 'brother mostly'.

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

I've seen this clue in The Telegraph.
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