Sorceress has rash symptom after whisky (5)
I believe the answer is:
witch
'sorceress' is the definition.
(synonyms)
'rash symptom after whisky' is the wordplay.
'rash symptom' becomes 'itch' (I've seen this in another clue).
'after' means one lot of letters go next to another.
'whisky' becomes 'W' (phonetic alphabet: alpha, bravo, charlie etc.).
'itch' after 'w' is 'WITCH'.
'has' acts as a link.
(Other definitions for witch that I've seen before include "Hag, crone" , "Broomstick riderof children's tales" , "'The Lion, the - - and the Wardrobe'" , "Enchantress" , "Woman using magic" .)