Retains less than one purchased (3)
I believe the answer is:
has
'retains' is the definition.
(I've seen this in another clue)
'less than one purchased' is the wordplay.
'HAS' is hidden within the letters.
However, I'm uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for has that I've seen before include "Contains" , "suffers from" , "Gives birth to" , "Bears" , "Cheats" .)