Exposure of tape with concealed bug (5)
I believe the answer is:
aphid
'bug' is the definition.
(type of insect)
'exposure of tape with concealed' is the wordplay.
'exposure of' indicates the central letters (internal letters get exposed).
'with' says to put letters next to each other.
'concealed' becomes 'hid' ('hide' can be a synonym of 'conceal').
The middle letters of 'tape' are 'ap'.
'ap'+'hid'='APHID'
(Other definitions for aphid that I've seen before include "Sap-sucking bug" , "little sucker" , "Horticultural pest" , "Plant louse" , "Greenfly etc" .)