The main section’s working for run of performances (6)
I believe the answer is:
season
'run of performances' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe there's a link between them I don't understand?
'the main section's working' is the wordplay.
'the main' becomes 'sea' (synonyms).
'section' becomes 's' (legal abbreviation).
'working' becomes 'on'.
'sea'+'s'+'on'='SEASON'
'for' is the link.
Can you help me to learn more?
(Other definitions for season that I've seen before include "Period of a year" , "Eg, summer" , "Add salt, pepper, spice etc" , "temper" , "such as 'Summertime'" .)