Telegram slipped under yellow mesh (7,4)
I believe the answer is:
chicken wire
'mesh' is the definition.
(I know that chicken wire is a type of mesh)
'telegram slipped under yellow' is the wordplay.
I cannot really see how this works, but
'telegram' could be 'wire' (synonyms) and 'wire' is found in the answer.
'yellow' could be 'chicken' (as in cowardly) and 'chicken' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for chicken wire that I've seen before include "Hexagonal metal mesh" , "Netting with a small hexagonal mesh" , "layers behind it?" .)