Crossword Genius

Should Byrd die, his varieties could be cross bred (10)

Ross

I believe the answer is:

hybridised

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

'should' is the definition.
Both the definition and answer are verbs in their base form.
Maybe you can see an association between them that I can't see?

'byrd die his varieties could be cross bred' is the wordplay.
'byrd die his' can be anagrammed to 'HYBRIDISED'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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