Fellow at hotel is former PM (5)
I believe the answer is:
heath
'former pm' is the definition.
(I've seen this before)
'fellow at hotel' is the wordplay.
'fellow' becomes 'he' (I've seen this in other clues**).
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'he'+'at'+'h'='HEATH'
'is' acts as a link.
(Other definitions for heath that I've seen before include "Tract of uncultivated land with scrubby vegetation" , "Place of gorse/heather" , "Barren open country" , "Ted - - (former PM)" , "Open land with acid soil" .)