A group of spies hide a camera at first in a shrub (6)
I believe the answer is:
acacia
'shrub' is the definition.
(I've seen this before)
'a group of spies hide a camera at first' is the wordplay.
'group of spies' becomes 'cia' (Central Intelligence Agency).
'hide' indicates putting letters inside.
'at first' indicates taking the first letters.
The first letter of 'camera' is 'c'.
'a'+'c'='ac'
'cia' going around 'ac' is 'cacia'.
'a'+'cacia'='ACACIA'
'in a' acts as a link.
(Other definitions for acacia that I've seen before include "Tree or shrub with yellow or white flowers" , "Wattle that grows" , "Spiny tree of warm climates" , "Gum-yielding tree ir shrub" , "Garden shrub, also known as wattle" .)