Rodent that turns up with a cat and a sheep (6)
I believe the answer is:
marmot
'rodent that turns' is the definition.
'marmot' can be an answer for 'rodent' (marmot is a kind of rodent). I am unsure of the rest of the definition.
'up with a cat and a sheep' is the wordplay.
'up with' shows that the letters should be reversed in order (move letters in down clue up).
'a cat' becomes 'tom' (a tom is a male cat).
'and' says to put letters next to each other.
'a sheep' becomes 'ram' (male sheep).
'tom'+'ram'='tomram'
'tomram' written backwards gives 'MARMOT'.
Can you help me to learn more?
(Other definitions for marmot that I've seen before include "Small burrowing animal of the squirrel family" , "Furry burrowing rodent" , "Stout, burrowing rodent" , "wild rodent" , "Creature" .)