Come out with past allegation (7)
I believe the answer is:
exclaim
'come out' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
'with past allegation' is the wordplay.
'with' means one lot of letters go next to another.
'past' becomes 'ex' (similar in meaning).
'allegation' becomes 'claim' (I've seen this in another clue).
'ex' next to 'claim' is 'EXCLAIM'.
Can you help me to learn more?
(Other definitions for exclaim that I've seen before include "Express surprise" , "Speak sharply" , "Declare" , "Announce vehemently" , "Call" .)