Prisoner pictured coffee cup with espresso? (7)
I believe the answer is:
mugshot
'prisoner pictured coffee' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'cup with espresso?' is the wordplay.
'cup' becomes 'mug' (I've seen this before).
'with' says to put letters next to each other.
'espresso?' becomes 'shot' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'mug'+'shot'='MUGSHOT'
Can you help me to learn more?
(Other definitions for mugshot that I've seen before include "Photo of ones face" , "Police photo (colloq.)" , "record made by police" , "Police ID photograph" , "picture" .)