Queen's broken toe is tender (5)
I believe the answer is:
quote
'tender' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'queen's broken toe' is the wordplay.
'queen' becomes 'qu' (abbreviation for queen).
'broken' indicates anagramming the letters.
'toe' is an anagram of 'ote'.
'qu'+'ote'='QUOTE'
'is' is the link.
Can you help me to learn more?
(Other definitions for quote that I've seen before include "That's what was said" , "Cite - likely cost of work to be done" , "quantify the damage" , "Give estimate of (price)" .)