25/11 across
That
man
follows
backwash
of
river
froth
(6)
That man follows backwash of river froth (6)
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The definition is at the end of the clue.
How the clue works
Look at froth — that's your definition, as in to bubble furiously. The river Tees reversed (your "backwash of river") gives you SEET, and then HE ("that man") follows it to complete the word.