Seize an advantage from what each other across answer has (4,2)
I believe the answer is:
cash in
'seize an advantage from what each other across answer' is the definition.
I can't judge whether this definition defines the answer.
'has' is the wordplay.
I cannot quite see how this works, but
an anagram of 'has' is 'ash' which is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cash in that I've seen before include "Take advantage of" , "what piggy bank has?" , "Exchange for money; seize an advantage" , "Realise" , "Make money" .)