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Warmer in the main with huge opening flower? (4,6)

Ross

I believe the answer is:

gulf stream

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

'warmer in the main with huge opening flower?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'opening flower?' is the wordplay.
'opening' becomes 'gulf' (gulf is a kind of opening).
'flower?' becomes 'stream' (I've seen this before).
'gulf'+'stream'='GULF STREAM'

Can you help me to learn more?

(Other definitions for gulf stream that I've seen before include "Warm Atlantic current" , "thats currently warming us" , "North Atlantic Drift" .)

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