Thorn (7)

I think it could be either:

prickle

pricker

'thorn' is the definition.
(synonyms)

This is all the clue.

(Other definitions for prickle that I've seen before include "may be a bit of a pain" , "sharp point" , "Short spine" , "Stinging sensation" , "Spine, thorn" .)

I've seen this clue in The Guardian, The Independent, the Wall Street Journal, The Telegraph and The Sun.

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