I snore badly, getting older (6)
I believe the answer is:
senior
'older' is the definition.
(similar in meaning)
'i snore badly getting' is the wordplay.
'badly' indicates anagramming the letters (letters in the wrong order).
'getting' indicates putting letters inside.
'snore' is an anagram of 'senor'.
'i' inserted inside 'senor' is 'SENIOR'.
(Other definitions for senior that I've seen before include "Elder (of two)" , "'Older, superior (6)'" , "High-ranking" , "Denoting older people" , "Superior - elder" .)