Lagging Rebus #535

If your new to Rebuses, you can read how to solve a Rebus here (link opens in a new window).
Do you need a little help? Click to reveal a clue to the above Rebus.
Here is clue to help decipher the hidden meaning. To fall behind someone or something.


Do you think you have got it? Click to view the answer.
The word “Lagging” is backwards, to give the answer: Lagging Behind.