Shows emotion and is destructive? Doesn't sound like it (5,2)
I believe the answer is:
tears up
'shows emotion' is the definition.
Although both the answer and definition are verbs in their -s form, I don't see how they can define each other.
'is destructive? doesn't sound like it' is the wordplay.
I cannot really understand how this works, but
'sound' could be 'ear' (I've seen this in other clues) and 'ear' is found in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
The remaining letters 'sup' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for tears up that I've seen before include "Shreds" , "Cancels" .)