Popular name for hostelry (3)
I believe the answer is:
inn
'for hostelry' is the definition.
(synonyms)
'popular name' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'name' becomes 'n' (common abbreviation e.g. on forms).
'in'+'n'='INN'
(Other definitions for inn that I've seen before include "Jamaica, for one" , "Pub with lodging" , "English country pub" , "watering-hole" , "Possibly Jamaica" .)