Tense, small daughter finds river (5)
I believe the answer is:
tweed
'river' is the definition.
(river in Scotland)
'tense small daughter' is the wordplay.
'tense' becomes 't' (abbreviation used in many dictionaries).
'small' becomes 'wee' (Scottish term for small).
'daughter' becomes 'd' (genealogical abbreviation).
't'+'wee'+'d'='TWEED'
'finds' is the link.
(Other definitions for tweed that I've seen before include "River; rough cloth" , "rough stuff" , "River on border between England and Scotland" , "Scottish and English river" , "Woollen material" .)