Checks regularly Laura's purchasing holiday (7)
I believe the answer is:
arrests
'checks' is the definition.
('arrest' can be a synonym of 'check')
'regularly laura's purchasing holiday' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'purchasing' means one lot of letters goes inside another (some letters take possession of others).
'holiday' becomes 'rest' (rest can mean a holiday or break).
The alternating letters of 'lauras' are 'ars'.
'ars' going around 'rest' is 'ARRESTS'.
(Other definitions for arrests that I've seen before include "Checks" , "made by police" , "Stops and takes into custody" , "Seizes and takes into custody" , "Apprehends" .)