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Uptight, nursing temperature, oxygen off the scale (6)

Ross

I believe the answer is:

atonal

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'off the scale' is the definition.
I can't tell whether this defines the answer.

'uptight nursing temperature oxygen' is the wordplay.
'uptight' becomes 'anal' (I've seen this in another clue).
'nursing' is an insertion indicator.
'temperature' becomes 't' (abbreviation).
'oxygen' becomes 'O' (atomic symbol for oxygen).
't'+'o'='to'
'anal' placed around 'to' is 'ATONAL'.

Can you help me to learn more?

(Other definitions for atonal that I've seen before include "Not in a key (mus.)" , "(Music) having no established key" , "(Of music) without key" , "Lacking traditional musical tone structure" , "Keyless" .)

I've seen this clue in The Times.
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