Describing one completely overcome by tears? (2,4,3)
I believe the answer is:
in full cry
'describing one' is the definition.
I know nothing about this answer so I can't tell whether this works.
'completely overcome by tears?' is the wordplay.
'completely' becomes 'in full' (in full means completely or totally).
'overcome by tears?' becomes 'cry' (I can't explain this - if you can you should give a lot more credence to this answer).
'infull'+'cry'='IN FULL CRY'
Can you help me to learn more?
(Other definitions for in full cry that I've seen before include "Hotly pursuing" , "hounds are on the scent?" , "A pack of hounds may be" .)