I look after grand old house in Greenland? (5)
I believe the answer is:
igloo
'house in greenland?' is the definition.
(type of house in Arctic regions)
'i look after grand old' is the wordplay.
'look' becomes 'lo' ('lo' is an archaic exclamation meaning 'look!').
'after' says to put letters next to each other.
'grand' becomes 'G' (G is short for ground as in a thousand).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'lo' put after 'g' is 'glo'.
'i'+'glo'+'o'='IGLOO'
(Other definitions for igloo that I've seen before include "Dome-shaped Eskimo house" , "series of chilly blocks" , "Dome-shaped dwelling" , "A house up north" , "northern home" .)