Brief looks caught in photographs taken quickly (9)
I believe the answer is:
snapshots
'brief looks' is the definition.
Although both the answer and definition are plural nouns, I cannot see how one could define the other.
'caught in photographs taken quickly' is the wordplay.
'caught in' indicates putting letters inside.
'photographs' becomes 'snaps' ('snap' can be a synonym of 'photograph').
'taken quickly' becomes 'shot' ('shoot' can be a synonym of 'take'. I am not sure about the 'quickly' bit.).
'snaps' going around 'shot' is 'SNAPSHOTS'.
Can you help me to learn more?
(Other definitions for snapshots that I've seen before include "Photographs" , "Informal photos" .)