"Can you repeat that?" (5)
(Other definitions for again that I've seen before include "Ocne more" , "On the other hand" , "Furthermore" , "Repeatedly" , "10 10 [AGAIN" .)
'can you repeat that?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for what that I've seen before include "Word used in a question" , "I beg your pardon" , "That which - come again!" , "Eh?" , "Which thing?" .)
(Other definitions for huh that I've seen before include "sorry?" , "Palindromic exclamation of disgust or surprise" , "Expression of disgust or surprise" .)