Try raising two different types of mammal (6)
I believe the answer is:
tackle
'try' is the definition.
'raising two different types of mammal' is the wordplay.
'raising' says the letters should be written in reverse.
'two different types of' becomes 'elk' (I can't justify this - if you can you should give a lot more credence to this answer).
'mammal' becomes 'cat' (cat is a kind of mammal).
'elk'+'cat'='elkcat'
'elkcat' reversed gives 'TACKLE'.
(Other definitions for tackle that I've seen before include "Confront" , "Deal with; equipment" , "Try - made by a rugby player?" , "Try to deal with fishing gear" , "things" .)