America perhaps putting horse into space? (6)
I believe the answer is:
eponym
'america perhaps' is the definition.
I can't judge whether this defines the answer.
'horse into space?' is the wordplay.
'horse' becomes 'pony' (pony is a kind of horse).
'into' means one lot of letters goes inside another.
'space?' becomes 'em' (in typography, a space as wide as a letter 'm').
'pony' placed inside 'em' is 'EPONYM'.
'putting' is the link.
Can you help me to learn more?
(Other definitions for eponym that I've seen before include "Name of person after whom something is named" , "Hero" , "Word derived from person's name or placename" , "a mackintosh, for instance" , "Place-name derived from name of a person" .)