Crossword Genius

Flip gospeller almost into the sea by public hotel (4,2,3,5)

Ross

I believe the answer is:

foam at the mouth

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

'flip gospeller almost into the sea' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'by public hotel' is the wordplay.
I cannot quite see how this works, but
'by' could be 'at' and 'at' is found within the answer.
'public' could be 'out' (I've seen this before) and 'out' is located in the answer.
'hotel' could be 'h' (phonetic alphabet: alpha, bravo, charlie etc.) and 'h' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for foam at the mouth that I've seen before include "furious" , "Waves where river meets sea" , "See red" , "scum where river meets sea?" .)

I've seen this clue in The Times.
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