Regularly turn up with a new vacuous celebrity, resulting in repeated shirking (7)
I believe the answer is:
truancy
'repeated shirking' is the definition.
'truancy' can be an answer for 'shirking' (thesaurus). I am unsure of the 'repeated' bit.
'regularly turn up with a new vacuous celebrity' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'with' means one lot of letters go next to another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'vacuous' suggests removing the centre.
'celebrity' with its middle removed is 'cy'.
'turn'+'up'='turnup'
The alternating letters of 'turnup' are 'tru'.
'tru'+'a'+'n'+'cy'='TRUANCY'
'resulting in' acts as a link.
Can you help me to learn more?
(Other definitions for truancy that I've seen before include "bunking off" , "Unauthorised absence from school" , "Failure to attend school" , "Staying away from school" .)