Sean was regularly interrupting work for digital growth (7)
I believe the answer is:
toenail
'digital growth' is the definition.
(digit as in finger or toe)
'sean was regularly interrupting work' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'interrupting' indicates putting letters inside.
'work' becomes 'toil' (toiling is a kind of working).
'sean'+'was'='seanwas'
The alternating letters of 'seanwas' are 'ena'.
'ena' put within 'toil' is 'TOENAIL'.
'for' is the link.
(Other definitions for toenail that I've seen before include "One of ten" , "may need this cut?" , "Digital cover-- 21 across (anag)" , "Digital coverage" , "Footplate, perhaps" .)