A pin I held, altering bloomers (9)

I believe the answer is:

delphinia

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

'a pin i held altering' is the wordplay.
'altering' indicates an anagram.
'a'+'pin'+'i'+'held'='apiniheld'
'apiniheld' is an anagram of 'DELPHINIA'.

Can you help me to learn more?

(Other definitions for delphinia that I've seen before include "Larkspurs" , "plants" .)

I've seen this clue in The Times and The Sunday Times.

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