Unwelcome on a ship but they pay for accommodation (8)
I believe the answer is:
boarders
'ship but they pay for accommodation' is the definition.
The definition suggests an adverb but the answer is not.
'unwelcome on a' is the wordplay.
I cannot quite see how this works, but
'a' is present in the answer.
The remaining letters 'borders' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for boarders that I've seen before include "Live-in school students" , "Students staying at school" , "group of schoolchildren?" , "ones who get on" , "Resident pupils in school" .)