A question of who sounds like a sorceress? (5)
I believe the answer is:
which
'a question of who' is the definition.
'which' can be an answer for 'a question'. I'm not certain of the rest of the definition.
'sounds like a sorceress?' is the wordplay.
'sounds like' indicates a 'sounds like' (homophone) clue.
'a sorceress?' becomes 'witch' (I've seen this before).
'witch' is a homophone of 'WHICH'.
Can you help me to learn more?
(Other definitions for which that I've seen before include "Organisation giving information to consumers" , "Consumer magazine" , "What one?" .)