Garden visitor from Wycombe expected (3)
I believe the answer is:
bee
'garden visitor' is the definition.
(I've seen this in another clue)
'from wycombe expected' is the wordplay.
'from' indicates a hidden word.
'BEE' is hidden in the letters of 'wycombe expected'.
(Other definitions for bee that I've seen before include "Apian insect" , "Social insect" , "Busy person" , "Insect that bumbles?" , "In one's bonnet, it's a persistent idea" .)