Crossword Genius

Half a constellation appears pale blue (4)

Ross

I believe the answer is:

aqua

'pale blue' is the definition.
(aqua is a shade of blue)

'half a constellation' is the wordplay.
'half a' indicates taking half.
'constellation' becomes 'aquarius' (Aquarius is an example).
'aquarius' halved is 'AQUA'.

'appears' acts as a link.

(Other definitions for aqua that I've seen before include "shade" , "Latin for water" , "- - Libra" , "Light bluish-green -- water" , "-- fortis, 'strong water'" .)

I've seen this clue in The Times.
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