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Carrier needing to change hospital for small blister (7)

Ross

I believe the answer is:

vesicle

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'blister' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for vesicle that I've seen before include "Symptom of cowpox" , "Blister of clear fluid" , "Container for serum" .)

I've seen this clue in The Telegraph.
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