Radio presenter’s shortened act getting the bird (6)
I believe the answer is:
deejay
'radio presenter's' is the definition.
(I've seen this before)
'shortened act getting the bird' is the wordplay.
'shortened' means to remove the last letter.
'act' becomes 'deed' (deed is a kind of act).
'getting' is a charade indicator (letters next to each other).
'the bird' becomes 'jay' (jay is a kind of bird**).
'deed' with its last letter taken away is 'dee'.
'dee'+'jay'='DEEJAY'
(Other definitions for deejay that I've seen before include "Music-maker" , "Record presenter" , "Radio disc man" , "Disc-jockey" , "Informal disc jockey" .)