Animal groomed regularly - expensive, we hear (3,4)
I believe the answer is:
roe deer
'animal' is the definition.
(thesaurus)
'groomed regularly expensive we hear' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'expensive' becomes 'dear' (I've seen this before).
'we hear' indicates a 'sounds like' (homophone) clue.
The alternate letters of 'groomed' are 'roe'.
'dear' sounds like 'deer'.
'roe'+'deer'='ROE-DEER'
(Other definitions for roe deer that I've seen before include "Forest animal" , "Hoofed animal(s)" , "Antlered woodland creature" , "Ruminant, reddish in summer" , "Small hoofed animal from Eurasia" .)