Appeal of tea room (5)
I believe the answer is:
charm
'appeal' is the definition.
('charm' can be a synonym of 'appeal')
'tea room' is the wordplay.
'tea' becomes 'cha' (cha is a type of tea).
'room' becomes 'rm' (I've seen this in other clues).
'cha'+'rm'='CHARM'
'of' acts as a link.
(Other definitions for charm that I've seen before include "Allure" , "Enchant" , "pleasing feature" , "Enrapture" , "Personal attraction" .)