Accommodation that's popular recluse regularly ignored (6)
I believe the answer is:
hotels
'accommodation' is the definition.
'popular recluse regularly ignored' is the wordplay.
'popular' becomes 'hot' (similar in meaning).
'regularly ignored' means one should take alternating letters (letters removed at regular intervals).
The alternating letters of 'recluse' are 'els'.
'hot'+'els'='HOTELS'
'that's' is the link.
(Other definitions for hotels that I've seen before include "Ritz and Hilton are" , "Lodging houses" , "Establishments providing rooms and meals" , "Establishments for travellers" , "Buildings for travellers" .)