Take me abroad to capture river mammal (7)
I believe the answer is:
meerkat
'mammal' is the definition.
(meerkat is a kind of mammal)
'take me abroad to capture river' is the wordplay.
'abroad' is an anagram indicator.
'to capture' means one lot of letters goes inside another.
'river' becomes 'r'.
'take'+'me'='takeme'
'takeme' anagrammed gives 'meekat'.
'meekat' placed around 'r' is 'MEERKAT'.
(Other definitions for meerkat that I've seen before include "Small southern African mongoose" , "African mongoose often on two feet" , "South African native" , "South African mammal" , "S. African animal" .)