Uncouth young guy outside, say, surprisingly spreads neatly (4,3)
I believe the answer is:
lays out
'spreads neatly' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their -s form.
Perhaps they are linked in a way I don't understand?
'uncouth young guy outside say surprisingly' is the wordplay.
'uncouth young guy' becomes 'lout' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'outside' means one lot of letters goes inside another.
'surprisingly' indicates anagramming the letters (a surprising ordering of the letters).
'say' with letters rearranged gives 'ays'.
'lout' placed around 'ays' is 'LAYS OUT'.
Can you help me to learn more?
(Another definition for lays out that I've seen is " Spends money on".)