Clue: Anonymous solitary plant (4)
Answer: ALOE
Explanation: Definition: plant

**ALO**(n)**E** ("solitary" with N (name) removed) ("nameless" = "anonymous")
 

 
*I think some people may see this as falling into the same category as an indirect anagram, as you need to take two steps to work out the N is missing. I quite like the clue, but it's not entirely fair.