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Quiet type who shows endurance — a ''sticker (7)

Ross

I believe the answer is:

plaster

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'''sticker' is the definition.
(thesaurus)

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(Other definitions for plaster that I've seen before include "Spread" , "Small wound covering" , "Wall surface" , "Stuff that sticks on ceilings or wounds" , "one sticking on through injury?" .)

I've seen this clue in The Times.
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