Nurse opens IV treatment, eliciting no reaction (12)

I believe the answer is:

unresponsive

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'eliciting no reaction' is the definition.
I can't tell whether this definition defines the answer.

'nurse opens iv treatment' is the wordplay.
'treatment' is an anagram indicator (letters treated or processed differently).
'nurse'+'opens'+'iv'='nurseopensiv'
'nurseopensiv' anagrammed gives 'UNRESPONSIVE'.

Can you help me to learn more?

(Other definitions for unresponsive that I've seen before include "Not reacting to stimuli" , "Not answering" , "disengaged" .)

I've seen this clue in The Irish Times.

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