Get to (5)
(Other definitions for annoy that I've seen before include "Irk" , "Exasperate" , "Nark - nettle" , "eat" , "Gall" .)
'get to' is the definition.
(synonyms)
This is all the clue.
(Other definitions for reach that I've seen before include "bay" , "Scope; get to" , "Get to < throw up in the old" , "It's an advantage for a boxer" , "Arrive at - stretch of river" .)
'get to' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for unnerve that I've seen before include "Rattle" , "Frighten" , "scare" , "Disheartened" , "Perturb" .)