Covers of Elvis, Voice singer's top compositions (6)
I believe the answer is:
essays
'compositions' is the definition.
(I've seen this before)
'covers of elvis voice singer's top' is the wordplay.
'covers of' means to remove the middle letters.
'voice' becomes 'say' (I've seen this in another clue).
'top' suggests taking the first letters (in a down clue, the first letter is top).
'elvis' with its centre taken out is 'es'.
The initial letter of 'singer' is 's'.
'es'+'say'+'s'='ESSAYS'
(Other definitions for essays that I've seen before include "Dissertations" , "Makes attempt to do short pieces of writing" , "Endeavours" , "Literary efforts" , "Students' works" .)