Caught in Seine swimming with female members of family (6)
I believe the answer is:
nieces
'female members of family' is the definition.
'caught in seine swimming' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'in' means one lot of letters goes inside another.
'swimming' indicates an anagram.
'seine' with letters rearranged gives 'niees'.
'c' going within 'niees' is 'NIECES'.
'with' is the link.
(Other definitions for nieces that I've seen before include "Relations" , "Young female relatives" , "They're related" , "Relatives of 27dn" , "Relative girls" .)