Grassy weed to see with a cry of pain! (5)
I believe the answer is:
couch
'grassy weed' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'see with a cry of pain' is the wordplay.
'see' becomes 'c' (the word for the letter, according to Chambers).
'with' says to put letters next to each other.
'a cry of pain' becomes 'ouch' (I've seen this before).
'c'+'ouch'='COUCH'
'to' is the link.
Can you help me to learn more?
(Other definitions for couch that I've seen before include "Long seat; grass" , "express" , "Upholstered seat for more than one" , "Sofa or settee" , "something comfortable to sit on" .)