Fruit web-footed bird found by touring English rivers (10)
I believe the answer is:
gooseberry
'fruit' is the definition.
(gooseberry is a kind of fruit)
'web-footed bird found by touring english rivers' is the wordplay.
'web-footed bird' becomes 'goose' (geese have webbed feet).
'found' is a charade indicator (letters next to each other).
'touring' means one lot of letters goes inside another (touring can mean going round).
'english' becomes 'E' (abbreviation).
'rivers' becomes 'rr' (an abbreviation for river written twice).
'e'+'rr'='err'
'by' going around 'err' is 'berry'.
'goose'+'berry'='GOOSEBERRY'
(Other definitions for gooseberry that I've seen before include "Fruit - unwanted third person" , "Third-party" , "it bears fruit" , "One unwelcome near passion" , "Some intruders play it" .)