Crossword Genius

Fluid altering shape (8)

Ross

I believe the answer is:

triangle

'shape' is the definition.
(triangle is a kind of shape)

'fluid altering' is the wordplay.
'fluid' indicates an anagram.
'altering' anagrammed gives 'TRIANGLE'.

(Other definitions for triangle that I've seen before include "Integral (anag) - figure" , "Alerting (anag)" , "Three-sided shape" , "Constellation - three-sided figure" , "Geometrical figure - musical instrument" .)

I've seen this clue in The Independent.
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