Swift brute, rolling over, loves animal feed (5)
I believe the answer is:
yahoo
'swift brute' is the definition.
(I've seen this before)
'rolling over loves animal feed' is the wordplay.
'rolling over' says the letters should be written in reverse.
'loves' becomes 'oo' (love means 0 in tennis).
'animal feed' becomes 'hay' (hay is a kind of feed. I am not sure about the 'animal' bit.).
'oo'+'hay'='oohay'
'oohay' in reverse letter order is 'YAHOO'.
Can you help me to learn more?
(Other definitions for yahoo that I've seen before include "Swiftian brute" , "Ugly swipe at delivery" , "Uncouth person" , "Brutish race of people in "Gulliver's Travels"" , "Savage" .)