Somehow slit almost traps toe on elephant's foot (8,5)

'elephant's foot' is the definition.
('tortoise plant' can be a synonym of 'elephant's foot')

'somehow slit almost traps toe on' is the wordplay.
'somehow' is an anagram indicator.
'almost' means to remove the first letter.
'slit' with its first letter taken off is 'lit'.
'lit'+'traps'+'toe'+'on'='littrapstoeon'
'littrapstoeon' with letters rearranged gives 'TORTOISE-PLANT'.