Keeper has a dog on the hill (7)
I believe the answer is:
curator
'keeper' is the definition.
(I know that curator is a type of keeper)
'a dog on the hill' is the wordplay.
'dog' becomes 'cur' (a cur is an aggressive or scruffy dog).
'on' says to put letters next to each other.
'the hill' becomes 'tor' (tor is a kind of hill).
'a' put after 'cur' is 'cura'.
'cura'+'tor'='CURATOR'
'has' acts as a link.
(Other definitions for curator that I've seen before include "museum boss" , "Museum custodian" , "Person in charge of a museum" , "Museum keeper" , "Cultural employee" .)