Not all photos are steamy (3)
I believe the answer is:
hot
'steamy' is the definition.
(both can mean erotic)
'not all photos are' is the wordplay.
'not all' says the answer is hidden in the clue (only some of the letters).
'HOT' is hidden in the letters of 'photos are'.
(Other definitions for hot that I've seen before include "recently stolen" , "Very popular" , "Having a high temperature" , "Flaming - spicy" , "Torrid" .)