Perfectly happy making notes on electrical interference (8)

I believe the answer is:

ecstatic

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'perfectly happy' is the definition.
'ecstatic' can be an answer for 'happy' (thesaurus). I'm unsure of the 'perfectly' bit.

'notes on electrical interference' is the wordplay.
'notes' becomes 'ec'.
'on' says to put letters next to each other.
'electrical interference' becomes 'static' (I've seen this before).
'ec'+'static'='ECSTATIC'

'making' acts as a link.

Can you help me to learn more?

(Other definitions for ecstatic that I've seen before include "On cloud nine" , "Overjoyed, quite delighted" , "In a state of great delight" , "Really overjoyed, gleeful" , "Jubilant" .)

I've seen this clue in the Evening Standard.

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