Sort of cat is returned in the morning and leashed regularly (7)
I believe the answer is:
siamese
'sort of cat' is the definition.
'is returned in the morning and leashed regularly' is the wordplay.
'returned in' is a reversal indicator (I've seen 'returning in' mean this).
'the morning' becomes 'am'.
'and' is a charade indicator (letters next to each other).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
The alternate letters of 'leashed' are 'ese'.
'is' written backwards gives 'si'.
'si'+'am'+'ese'='SIAMESE'
(Other definitions for siamese that I've seen before include "sort of twins" , "Cat - Thai?" , "type of cat" , "Pugnacious aquarium species -- shagginess, if I'm thief (anag)" , "Twin" .)