Magician adjusted to crowd, hiding irritation (5,6)
I believe the answer is:
witch doctor
'magician' is the definition.
(witch-doctor is a kind of magician)
'adjusted to crowd hiding irritation' is the wordplay.
'adjusted' indicates an anagram.
'hiding' is an insertion indicator.
'irritation' becomes 'itch' (I've seen this before).
'to'+'crowd'='tocrowd'
'tocrowd' is an anagram of 'wdoctor'.
'wdoctor' enclosing 'itch' is 'WITCH-DOCTOR'.
(Other definitions for witch doctor that I've seen before include "Medicine man" , "Shaman" , "Tribal magician" .)