Enter on tiptoe Crossword Clue

 The answer to the crossword clue "enter on tiptoe" is SNEAKIN.

The word "sneaking" can be used as a verb or as an adjective. As a verb, it means to move or act in a stealthy or furtive manner. As an adjective, it means characterized by stealth or secrecy.

In the context of the crossword clue, the word "sneaking" is being used as a verb. It is suggesting that the person or thing entering is doing so in a quiet and stealthy manner, so as not to be noticed.

Here are some other possible answers for the crossword clue "enter on tiptoe":

Slinking

Sidling

Treading lightly

Moving quietly

Approaching cautiously

The specific answer to the crossword clue will depend on the context of the puzzle. However, all of these terms refer to ways of entering a place quietly and without being noticed.