Persistent hanger-on exhausted visitor from far away? (6)
I believe the answer is:
limpet
'persistent hanger-on' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'exhausted visitor from far away?' is the wordplay.
'exhausted' becomes 'limp' (I've seen this before).
'visitor from far away?' becomes 'et' (I am not sure about this - if you are sure you should believe this answer much more).
'limp'+'et'='LIMPET'
Can you help me to learn more?
(Other definitions for limpet that I've seen before include "Shellfish that sticks to surface" , "Proverbially clingy mollusc" , "Clinging gastropod" , "Mollusc adhering to rocks" , "It clings to rock surfaces" .)