Fall behind (3)

I believe the answer is:

lag

'fall behind' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for lag that I've seen before include "An old one is a convict" , "Wrap water-pipes; fall behine" , "Convict (slang)" , "Wrap to protect from frost" , "Drop behind" .)

I've seen this clue in the L.A. Times Sunday, The Irish Times, The New York Times, the L.A. Times Magazine, The Telegraph, The Sun, The Mirror, the Newsday, The Star Tribune, The Times, the King Feature Syndicate, the Universal, the USA Today, the LA Times, The Guardian and The Wall Street Journal.

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