Parts that can be sore around the end of April (5)
I believe the answer is:
roles
'parts' is the definition.
('role' can be a synonym of 'part')
'can be sore around the end of april' is the wordplay.
'can be' indicates an anagram.
'around' indicates putting letters inside.
'the end of' indicates one should take the final letters.
The last letter of 'april' is 'l'.
'sore' anagrammed gives 'roes'.
'roes' placed around 'l' is 'ROLES'.
'that' is the link.
(Other definitions for roles that I've seen before include "Actors' parts" , "Parts in a play" , "Theatrical parts" , "Parts in plays" , "Dramatic parts" .)