Ideal song playing nearby (9)

I believe the answer is:

alongside

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'nearby' is the definition.
Both the answer and definition are adverbs. Maybe they are linked in a way I don't understand?

'ideal song playing' is the wordplay.
'playing' indicates an anagram.
'ideal'+'song'='idealsong'
'idealsong' is an anagram of 'ALONGSIDE'.

Can you help me to learn more?

(Other definitions for alongside that I've seen before include "close to a bank" , "Next to - alien dogs (anag)" , "Age-old sin (anag.)" , "Lying close to" , "next door" .)

I've seen this clue in The Irish Times.

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