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Speak for a long time in hotel, long-standing, overlooking Scottish river (4,5)

Ross

I believe the answer is:

hold forth

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'speak for a long time' is the definition.
I can't tell whether this definition defines the answer.

'hotel long-standing overlooking scottish river' is the wordplay.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'long-standing' becomes 'old' ('old' can be similar in meaning to 'long-standing').
'overlooking' is a charade indicator (letters next to each other) (down clues only).
'scottish river' becomes 'forth' (I've seen this before).
'h'+'old'+'forth'='HOLD FORTH'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for hold forth that I've seen before include "speak in public?" , "lecture" , "Speak at length" , "Present" , "Show how to" .)

I've seen this clue in The Telegraph.
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