Organising tour frequently bores musician (7)
I believe the answer is:
sorting
'organising' is the definition.
Although both the answer and definition are present participle verbs, I don't understand how they can define each other.
'tour frequently bores musician' is the wordplay.
'frequently' indicates alternate letters (letters selected at a regular frequency).
'bores' is an insertion indicator (to bore something can mean to drill into it).
'musician' becomes 'sting' (I can't explain this - if you can you should believe this answer much more).
The alternate letters of 'tour' are 'or'.
'or' put into 'sting' is 'SORTING'.
Can you help me to learn more?
(Other definitions for sorting that I've seen before include "Arranging in groups" , "Grouping by class" , "Classifying" .)