Horse in southern gardens, lacking hair (8)
I believe the answer is:
skewbald
'horse' is the definition.
(I've seen this before)
'southern gardens lacking hair' is the wordplay.
'southern' becomes 's' (abbreviation).
'gardens' becomes 'Kew' (Kew Gardens in London).
'lacking hair' becomes 'bald' (I've seen this in another clue).
's'+'kew'+'bald'='SKEWBALD'
'in' is the link.
(Other definitions for skewbald that I've seen before include "Bicoloured creature" , "patchy" , "(Horse) with white and coloured marks" , "maybe brown and white" , "Marked with patches of white and a colour" .)