Crossword Genius

Drink container hogged by father mostly (7)

Ross

I believe the answer is:

thermos

I'm a little stuck... Click here to teach me more about this clue!

'drink container' is the definition.
'thermos' can be an answer for 'container' (thermos is a kind of container). I'm not certain of the 'drink' bit.

'hogged by father mostly' is the wordplay.
'THERMOS' is hidden in amongst the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

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

I've seen this clue in The Times.
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