Crossword Genius

Description of movement's frequently a mess if Spooner spits it out (4-13)

Ross

I believe the answer is:

post-impressionist

'description of movement's' is the definition.
(description of an art movement)

'frequently a mess if spooner spits it out' is the wordplay.
'frequently' means one should take alternating letters (letters selected at a regular frequency).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'mess'+'if'='messif'
The alternating letters of 'messif' are 'msi'.
'msi'+'spooner'+'spits'+'it'='msispoonerspitsit'
'msispoonerspitsit' with letters rearranged gives 'POST-IMPRESSIONIST'.

(Other definitions for post-impressionist that I've seen before include "Cezanne or Gauguin, perhaps" , "Artist such as Gauguin or Seurat" , "Artist in a particular style" .)

I've seen this clue in The Independent.
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