Grant say for keeping young sheep round in group (8)
I believe the answer is:
category
'group' is the definition.
(both can mean a class or type)
'grant say for keeping young sheep round' is the wordplay.
'grant say' becomes 'cary' (actor Cary Grant).
'for keeping' means one lot of letters goes inside another.
'young sheep' becomes 'teg' (sheep in its second year).
'round' becomes 'o' (round can mean a round object).
'teg'+'o'='tego'
'cary' going around 'tego' is 'CATEGORY'.
'in' is the link.
(Other definitions for category that I've seen before include "Kind" , "Grey coat (anag.)" , "Class with the same attribute" , "Genre" , "Class, group" .)