Ignorant charge about church music (9,5)

I believe the answer is:

gregorian chant

'church music' is the definition.
(Gregorian chant is an example)

'ignorant charge about' is the wordplay.
'about' indicates anagramming the letters.
'ignorant'+'charge'='ignorantcharge'
'ignorantcharge' anagrammed gives 'GREGORIAN CHANT'.

(Other definitions for gregorian chant that I've seen before include "Medieval plainsong" , "variety of plainsong" .)

I've seen this clue in The Daily Express.

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