Break out in a skin rash, ginger up to the neck (5)
I believe the answer is:
'break out' is the definition.
(I know that break out can be written as erupt)
'a skin rash ginger up to the neck' is the wordplay.
'ERUPT' is hidden within the letters.
But, I am not sure how the hidden word is indicated.
'in' is the link.
Can you help me to learn more?
(Other definitions for erupt that I've seen before include "Break through (as a volcano)" , "Emit lava" , "Eject lava" , "Explode" , "Break out suddenly and violently" .)