Learner frequently at the top of the house (4)
I believe the answer is:
loft
'the top of the house' is the definition.
(space at the top of a house)
'learner frequently' is the wordplay.
'learner' becomes 'l' (as in a learner driver with L-plates on their car).
'frequently' becomes 'oft' (oft can mean frequently, eg oft-quoted).
'l'+'oft'='LOFT'
'at' acts as a link.
(Other definitions for loft that I've seen before include "Sky" , "Space inside a roof" , "Room At The Top" , "Open space at the top of a building" , "Room or space under a roof" .)