Good question Stan. My initial reaction is "No". You have been cleared to intercept the localiser but you cannot descend before permitted so to do.
Going back to my approach days, phraeseology could well have been " Descend three thousand feet, further with the ILS" In that case I would expect descent on the glideslope without further instruction. Having said that, if I needed you to maintain the last cleared altitude for separation, terrain clearance or any other reason, then I would have said so.
This will produce some interesting replies. I have little doubt that the phrase "Cleared for the ILS" (or similar) will raise it's head. I will comment further when it does!!
A I