Unusual Easter egg being hidden in that shrub (3,4)
I believe the answer is:
tea rose
'that shrub' is the definition.
(tea rose is a kind of shrub)
'unusual easter egg being hidden' is the wordplay.
'unusual' indicates anagramming the letters.
'egg' becomes 'o' (I've seen this in other clues).
'being hidden' indicates putting letters inside.
'easter' is an anagram of 'tearse'.
'tearse' going around 'o' is 'TEA-ROSE'.
'in' is the link.
(Other definitions for tea rose that I've seen before include "Eats roe (anag.)" , "Garden plant" , "Bloom" , "Flowering bush" , "Scented garden flower" .)