Incline towards a simple building (4-2)
I believe the answer is:
lean-to
'a simple building' is the definition.
(I've seen this before)
'incline towards' is the wordplay.
'incline' becomes 'lean' (synonyms).
'towards' becomes 'to' (I am not sure about this - if you are sure you should believe this answer much more).
'lean'+'to'='LEAN-TO'
Can you help me to learn more?
(Other definitions for lean-to that I've seen before include "Building put up against another" , "Outbuilding propped against another wall" , "Building added to another" , "Building with roof resting against larger building (4, 2)" , "Add-on building" .)