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Not sure Sage supports that kind of "holding".
Here is a workaround.
Define two versions of the function f,
one "anonymous" and one "explicit":
sage: f = function('f')
sage: ff(x) = x**2
Use the symbolic one to define g:
sage: g(y) = f(y) + 2*y
sage: g
y |--> 2*y + f(y)
When you need it, substitute:
sage: g.substitute_function(f, ff)
y^2 + 2*y
