Voice of albatross, a bird ascending (5)
I believe the answer is:
basso
'voice' is the definition.
(I know that basso is a type of singing voice)
'of albatross a bird ascending' is the wordplay.
'of' says the answer is hidden in the clue.
'ascending' shows that the letters should be reversed in order.
'ossab' can be found hidden inside 'albatross a bird'.
'ossab' reversed gives 'BASSO'.
(Other definitions for basso that I've seen before include "low voice" , "one's deep in sound" , "Singer" , "Lowest male singing voice (sometimes 'profundo')" .)