Clear lecturer put in photo in way out (8)
I believe the answer is:
explicit
'clear' is the definition.
(thesaurus)
'lecturer put in photo in way out' is the wordplay.
'lecturer' becomes 'l'.
'put in' means one lot of letters goes inside another.
'photo' becomes 'pic' (I've seen this before).
'in' is an insertion indicator.
'way out' becomes 'exit' ('exit' can be a synonym of 'way out').
'l' going inside 'pic' is 'plic'.
'plic' inserted inside 'exit' is 'EXPLICIT'.
(Other definitions for explicit that I've seen before include "leaves nothing to the imagination" , "Categorical" , "Clear and plain in language" , "Clearly shown or stated" , "Stated or shown directly, not ambiguous" .)