Repetitive phrase from ghost in a tomb (8)

I believe the answer is:

ostinato

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'repetitive phrase' is the definition.
'ostinato' can be an answer for 'phrase' (ostinato is a kind of phrase). I'm not sure about the 'repetitive' bit.

'from ghost in a tomb' is the wordplay.
'from' says the answer is hidden in the clue.
'OSTINATO' is hidden in the letters of 'ghost in a tomb'.

Can you help me to learn more?

(Other definitions for ostinato that I've seen before include "Continuously repeated musical phrase - soon at it (anag)" , "figure seen in bars" , "Ground-bass (mus.)" , "regular rhythm" , "melodic phrase" .)

I've seen this clue in The Guardian.

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