A loathsome creature; repel it somehow (7)
I believe the answer is:
reptile
'a loathsome creature' is the definition.
'reptile' can be an answer for 'creature' (reptile is a kind of creature). I am not sure about the 'a loathsome' bit.
'repel it somehow' is the wordplay.
'somehow' is an anagram indicator.
'repel'+'it'='repelit'
'repelit' with letters rearranged gives 'REPTILE'.
Can you help me to learn more?
(Other definitions for reptile that I've seen before include "Turtle, for example" , "Malignant creature" , "Cold-blooded animal like lizard or snake" , "Despicable sort" , "Cold-blooded beast" .)