Send away for a new basin for the hotel (6)
I believe the answer is:
'send away' is the definition.
(I've seen this before)
'new basin for the hotel' is the wordplay.
'new' is an anagram indicator.
'for' says to put letters next to each other.
'the hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'basin' with letters rearranged gives 'banis'.
'for a' is the link.
(Other definitions for banish that I've seen before include "Expel from a community or group" , "dislodge" , "Drive away, maybe from country" , "Expel or expatriate" , "'Cast out, ostracise (6)'" .)