If such a mistake could be called a bloomer (7)

I believe the answer is:

fuchsia

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'be called a bloomer' is the definition.
I can't tell whether this definition defines the answer.

'if such a mistake' is the wordplay.
'mistake' indicates anagramming the letters.
'if'+'such'+'a'='ifsucha'
'ifsucha' anagrammed gives 'FUCHSIA'.

'could' is the link.

Can you help me to learn more?

(Other definitions for fuchsia that I've seen before include "Tropical shrub with drooping flowers" , "Ornamental garden shrub" , "Purplish-red colour" , "One blooming" , "Vivid purplish-red" .)

I've seen this clue in The Irish Independent.

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