Sort of inspiration needed to fill guest rooms (5)
I believe the answer is:
estro
'sort of inspiration' is the definition.
(old-fashioned term for inspiration)
'to fill guest rooms' is the wordplay.
'to fill' indicates a hidden word (the answer fills part of the clue).
'ESTRO' is hidden in the letters of 'guest rooms'.
'needed' acts as a link.
(Other definitions for estro that I've seen before include "height of poetic inspiration" , "Poetic inspiration; store (anagram)" , "Enthusiasm" .)