Allegation by old flame will make you cry (7)
I believe the answer is:
exclaim
'cry' is the definition.
(I've seen this before)
'allegation by old flame' is the wordplay.
'allegation' becomes 'claim' (I've seen this before).
'by' says to put letters next to each other.
'old flame' becomes 'ex' (I've seen this in other clues).
'claim' after 'ex' is 'EXCLAIM'.
'will make you' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for exclaim that I've seen before include "Speak sharply" , "Express surprise" , "Cry out suddenly, as from pain or surprise" , "Cry out (in shock, etc)" , "Declare" .)