Ear (7)
'ear' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for lughole that I've seen before include "Organ with which to 15 (slang)" , "Ear (informal)" , "Ear (slang)" .)
(Other definitions for tin that I've seen before include "A silvery-white metal often in cans" , "Atomic number 50" , "Money" , "Silvery-white metal used in cans" , "Cornish metal?" .)