Be left wearing the lady's kilt regularly (7)
I believe the answer is:
inherit
'be left' is the definition.
(I've seen this before)
'wearing the lady's kilt regularly' is the wordplay.
'wearing' becomes 'in' (as in being 'in' certain clothes).
'the lady' becomes 'her' (I've seen this before).
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'kilt' are 'it'.
'in'+'her'+'it'='INHERIT'
(Other definitions for inherit that I've seen before include "Benefit from willing" , "Succeed as heir" , "Be bequeathed" , "Gain by succession" , "Receive (as part of estate)" .)