Crossword Genius

Big bottle with a banner on (6)

Ross

I believe the answer is:

flagon

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

'big bottle' is the definition.
'flagon' can be an answer for 'bottle' (I've seen this before). I'm not certain of the 'big' bit.

'with a banner on' is the wordplay.
'with' says to put letters next to each other.
'a banner' becomes 'flag' (I've seen this in another clue).
'flag'+'on' is 'FLAGON'.

Can you help me to learn more?

(Other definitions for flagon that I've seen before include "Large container for serving drink" , "Wine jug" , "Large round bottle as for cider" , "Large wine-bottle, jug" , "Drinking vessel" .)

I've seen this clue in the Sydney Morning Herald.
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