Carefully, French composer cut grass somewhere in Cambridgeshire (12)

I believe the answer is:

deliberately

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'carefully' is the definition.
Both the answer and definition are adverbs. Maybe there's a link between them I don't understand?

'french composer cut grass somewhere in cambridgeshire' is the wordplay.
'french composer' becomes 'Delibes' (Lo Delibes, 1836-1891).
'cut' means to remove the last letter.
'grass' becomes 'rat' (both can mean a snitch or informer).
'somewhere in cambridgeshire' becomes 'Ely' (Ely is a cathedral city in Cambridgeshire).
'delibes' with its last letter removed is 'delibe'.
'delibe'+'rat'+'ely'='DELIBERATELY'

Can you help me to learn more?

(Other definitions for deliberately that I've seen before include "as intended" , "On purpose" , "Consciously and intentionally" .)

I've seen this clue in The Telegraph.

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