Crossword Genius

Blister oozed endlessly on top of boot (4)

Ross

I believe the answer is:

bleb

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'blister' is the definition.
(synonyms)

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for bleb that I've seen is " Skin blister".)

I've seen this clue in The Times and The Sunday Times.
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