Crossword Genius

Boys may have a run on them; darners renew them (7)

Ross

I believe the answer is:

errands

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

'boys' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.

'have a run on them darners renew them' is the wordplay.
'darners' can be anagrammed to 'ERRANDS'.
However, I am not clear how this is indicated.

'may' acts as a link.

Can you help me to learn more?

(Other definitions for errands that I've seen before include "Missions" , "Trips to carry out tasks" , "Task-oriented trips" , "Darners (anag.)" , "Delivery journeys" .)

I've seen this clue in The Globe and Mail.
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