Thorn (7)
'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" .)
'thorn' is the definition.
(I've seen this in another clue)
This is the entire clue.