Crossword Genius

Plant where solitary workman at last relieved (4)

Ross

I believe the answer is:

aloe

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'plant' is the definition.
(aloe is a kind of plant)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for aloe that I've seen before include "Fleshy-leaved plant" , "Bitter fruit" , "has a bitter taste" , "Plant source of purgative drug" , ". . . . vera, soothing plant" .)

I've seen this clue in The Times.
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