Illustrate in rude pictures (6)
I believe the answer is:
depict
'illustrate' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Maybe you can see an association between them that I don't see?
'in rude pictures' is the wordplay.
'in' indicates the answer is hidden within the clue.
'DEPICT' is hidden in the letters of 'rude pictures'.
Can you help me to learn more?
(Other definitions for depict that I've seen before include "Show[S]" , "Show, illustrate" , "Paint" , "'Show, portray (6)'" , "Delineate" .)