Third husband sleeps with spicy photo (8)
I believe the answer is:
snapshot
'photo' is the definition.
(snapshot is a kind of photo)
'third husband sleeps with spicy' is the wordplay.
'third husband' becomes 's' (3rd letter of 'husband').
'sleeps' becomes 'naps' (napping is a kind of sleeping).
'with' says to put letters next to each other.
'spicy' becomes 'hot' (synonyms).
's'+'naps'+'hot'='SNAPSHOT'
(Other definitions for snapshot that I've seen before include "Informal photo" , "Bit of camerawork" , "Pan hosts over casual photo" , "Casual photograph" , "print" .)