Adjust air-con with a simple instrument (7)

I believe the answer is:

ocarina

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'simple instrument' is the definition.
'ocarina' can be an answer for 'instrument' (ocarina is a kind of instrument). I'm unsure of the 'simple' bit.

'adjust air-con with a' is the wordplay.
'adjust' is an anagram indicator.
'with' indicates putting letters inside.
'air'+'con'='aircon'
'aircon' is an anagram of 'ocrina'.
'ocrina' placed around 'a' is 'OCARINA'.

Can you help me to learn more?

(Other definitions for ocarina that I've seen before include "Flute-toned musical toy" , "Primitive wind instrument" , "music-maker" , "Bird-shaped flute" , "Play a musical toy in the ICA, Nora" .)

I've seen this clue in The Irish Times.

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