Able to change speech by painstaking development (11)

I believe the answer is:

elaboration

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'painstaking development' is the definition.
'elaboration' can be an answer for 'development' (elaboration is a kind of development). I'm not certain of the 'painstaking' bit.

'able to change speech by' is the wordplay.
'to change' is an anagram indicator.
'speech' becomes 'oration' (oration is a kind of speech).
'by' means one lot of letters go next to another.
'able' is an anagram of 'elab'.
'elab'+'oration'='ELABORATION'

Can you help me to learn more?

(Other definitions for elaboration that I've seen before include "Added refinement or detail" , "Development of further detail" , "Detailed development" , "Embellishment" .)

I've seen this clue in The Irish News.

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