Grunting beast rising up to capture small insect and a large mammal (5,5)
I believe the answer is:
giant panda
'large mammal' is the definition.
'giant panda' can be an answer for 'mammal' (giant panda is a kind of mammal). I also know that 'large' relates to this answer.
'grunting beast rising up to capture small insect and a' is the wordplay.
'grunting beast' becomes 'pig' (I can't justify this - if you can you should believe this answer much more).
'rising up' says the letters should be written in reverse (in a down clue, letters go up).
'to capture' means one lot of letters goes inside another.
'small insect' becomes 'ant' (I've seen this before).
'pig' in reverse letter order is 'gip'.
'gip' placed around 'ant' is 'giantp'.
'giantp'+'and'+'a'='GIANT PANDA'
Can you help me to learn more?
(Other definitions for giant panda that I've seen before include "Something native to China" , "Large black and white mammal" , "endangered species" , "Creature" , "furry animal" .)