Inclination to design pram (4)
I believe the answer is:
'inclination' is the definition.
(an inclined surface)
'design pram' is the wordplay.
'design' is an anagram indicator.
'pram' anagrammed gives 'RAMP'.
'to' is the link.
(Other definitions for ramp that I've seen before include "Incline" , "One's inclined" , "Sloping passage" , "Slope - swindle" , "cheat" .)