Colour, seeing sea creature hold down first keeper (6,4)

I believe the answer is:

salmon pink

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'colour' is the definition.
(salmon pink is a kind of colour)

'sea creature hold down first keeper' is the wordplay.
'sea creature' becomes 'salmon' (I am not sure about this - if you are sure you should believe this answer much more).
'hold down' becomes 'pin' (as in pinning down).
'first keeper' becomes 'k' (sst letter of 'keeper').
'salmon'+'pin'+'k'='SALMON PINK'

'seeing' acts as a link.

Can you help me to learn more?

(Other definitions for salmon pink that I've seen before include "Fishy shade?" , "Colour" .)

I've seen this clue in The Irish Times.

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