Wise Holly at sea turns sallow (9)

I believe the answer is:

yellowish

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'turns sallow' is the definition.
'yellowish' can be an answer for 'sallow' (thesaurus). I'm not certain of the 'turns' bit.

'wise holly at sea' is the wordplay.
'at sea' indicates anagramming the letters.
'wise'+'holly'='wiseholly'
'wiseholly' is an anagram of 'YELLOWISH'.

Can you help me to learn more?

(Other definitions for yellowish that I've seen before include "A little off-colour" , "somewhat lacking in courage?" , "Rather pale" , "with a bit of lemon" , "Similar to the colour of an egg yolk" .)

I've seen this clue in The Hindu.

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