Single again, but with great animosity (3)

I believe the answer is:

ire

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'with great animosity' is the definition.
The definition and answer can be both feelings as well as being singular nouns.
Maybe there's a link between them I don't understand?

'single again' is the wordplay.
'single' becomes 'i' (one**).
'again' becomes 're'.
'i'+'re'='IRE'

'but' is the link.

Can you help me to learn more?

(Other definitions for ire that I've seen before include "Displeasure" , "Losing head" , "Paddy" , "Outrage" , "Anger, rage" .)

I've seen this clue in the Evening Standard.

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