Crossword Genius

Painting that’s sea-blue? (11)

Ross

I believe the answer is:

watercolour

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

'painting' is the definition.
(I know that watercolour is a type of painting)

'sea-blue?' is the wordplay.
I cannot quite see how this works, but
'blue?' could be 'colour' (blue is a kind of colour) and 'colour' is found in the answer.
The remaining letters 'water' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for watercolour that I've seen before include "Type of painting" , "Painted picture" .)

I've seen this clue in The Times.
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