Holst composition with a slow movement (5)

I believe the answer is:

sloth

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'slow movement' is the definition.
'sloth' can be an answer for 'slow' (I've seen this before). I'm unsure of the 'movement' bit.

'holst composition' is the wordplay.
'composition' is an anagram indicator (letters arranged or composed in a different order).
'holst' with letters rearranged gives 'SLOTH'.

'with a' is the link.

Can you help me to learn more?

(Other definitions for sloth that I've seen before include "Indolence" , "one of a deadly collection" , "edentate" , "Laziness; slow mammal" , "Sinful" .)

I've seen this clue in the Evening Standard.

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