I wonder if there is a rule on that score. Judging from the examples below, it just looks as if you don't put a when one goes alone, and you have to use it when one goes with an adjective. Am I wrong?
We've run out of clean towels. - It's ok, I have a spare one.
I was looking for a clean towel but couldn't find one.
What towel would you like? - Just an ordinary one, I don't really care.
Can I have a towel? - Go to the bathroom and take one.
Did you buy me a towel? - Yes, a big yellow one.
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