Crossword Genius

I could be Moses, in spirit? (13)

Ross

I believe the answer is:

impressionist

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'i' is the definition.
Although both the answer and definition are adjectives, I cannot understand how one could define the other.

'could be moses in spirit?' is the wordplay.
'could be' indicates anagramming the letters.
'moses'+'in'+'spirit'='mosesinspirit'
'mosesinspirit' anagrammed gives 'IMPRESSIONIST'.

Can you help me to learn more?

(Other definitions for impressionist that I've seen before include "One who takes off others" , "Mimic" , "Person pretending to be another" , "artist?" , "Is he taking off" .)

I've seen this clue in The Independent.
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