Unusual to pierce blood donor there (3)

I believe the answer is:

odd

I'm a little stuck... Click here to teach me more about this clue!

'unusual' is the definition.
(similar in meaning)

'pierce blood donor there' is the wordplay.
'ODD' is hidden in amongst the letters.
But, I'm not sure how this is indicated.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for odd that I've seen before include "Peculiar or unpaired" , "like half the numbers?" , "Strange, bizarre" , "like twenty two [FIFTEEN]? Yes and no!" , "Strange, peculiar" .)

I've seen this clue in The Irish Times.

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