Crossword Genius

What happened during a transport strike in Algeria (4)

Ross

I believe the answer is:

oran

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

'in algeria' is the definition.
('Oran' is part of 'algeria')

'what happened during a transport strike' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is located in the answer.
The remaining letters 'or' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for oran that I've seen before include "Algerian port" , "Algerian seaport" , "African port" .)

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