Q:

r function alias memory space

Does alias function double memory space occupied by the function definition? 
Is this alternative aliasing memory saver? 
> ss=subset
> ss(glmC, donchian==don & in_fundo==F & C_V=='C', epsilon2)
  epsilon2
1    1e-07
> ss
function (x, ...) 
UseMethod("subset")
<bytecode: 0x0000000018797e70>
<environment: namespace:base>

# alternative aliasing
> ss=function(...) subset(...)
> ss
function(...) subset(...)
> ss(glmC, donchian==don & in_fundo==F & C_V=='C', epsilon2)
  epsilon2
1    1e-07 

A:

Is this alternative aliasing memory saver? 

No, it is not. 
ss = subset
ss1 = function(...) subset(...)

object.size(ss)
# 832 bytes
object.size(ss1)
# 1280 bytes

We can also using pryr::object_size, which may be more accurate. 
library(pryr)
object_size(ss)
# 832 B
object_size(ss1)
# 1.62 kB

However, the differences are so small that it is extremely difficult to imagine a situation in which they would matter.  And, if you were in such a memory-tight situation, presumably the most memory-efficient solution would be to not alias at all.