Drunk perhaps alone, one on the tiles? (7)
I believe the answer is:
shingle
'the tiles?' is the definition.
(thesaurus)
'drunk perhaps alone one on' is the wordplay.
'drunk perhaps' becomes 'h' (I can't justify this - if you can you should believe this answer much more).
'alone' becomes 'single' ('single' can be a synonym of 'alone').
'one on' indicates putting letters inside (as in clothing \'on\' a person).
'h' placed inside 'single' is 'SHINGLE'.
Can you help me to learn more?
(Other definitions for shingle that I've seen before include "English (anag)" , "may be lying on the beach" , "A tile; some beach" , "Collection of stones" , "beach? Yes and no" .)