Craven son starts showing age (7)
I believe the answer is:
yellows
'starts showing age' is the definition.
The answer and definition can be both related to change as well as being verbs in their -s form.
Maybe you can see a link between them that I can't see?
'craven son' is the wordplay.
I cannot quite see how this works, but
'son' could be 's' (genealogical abbreviation for son) and 's' is found within the answer.
The remaining letters 'yellow' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for yellows that I've seen before include "Turns lurid, perhaps" , "shows age" , "shades of autumn?" , "Plant disease" , "as broadsheet influenced by The Sun does?" .)