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Lowest sort of price one may pay for a piece of the seabed? (4,6)

Ross

I believe the answer is:

rock bottom

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'lowest' is the definition.
(thesaurus)

'may pay for a piece of the seabed?' is the wordplay.
'may pay' becomes 'ck' (I am not sure about this - if you are sure you should believe this answer much more).
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'a piece' becomes 'r' (abbreviation for Rook).
'of' becomes 'o''.
'the seabed?' becomes 'bottom' (seabed is a kind of bottom).
'r'+'o'='ro'
'ck' after 'ro' is 'rock'.
'rock'+'bottom'='ROCK-BOTTOM'

'sort of price one' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for rock bottom that I've seen before include "Lowest possible level" , "Total despair" , "Hard bed" , "As low as you can get" , "such a price is heavily reduced" .)

I've seen this clue in The Irish News.
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