Horse eats mincemeat and identity card? (4,3)
I believe the answer is:
name tag
'identity card?' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
'horse eats mincemeat' is the wordplay.
'horse' becomes 'nag' (term for an old horse).
'eats' means one lot of letters goes inside another.
'mincemeat' becomes 'meta' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'nag' placed around 'meta' is 'NAME TAG'.
'and' is the link.
Can you help me to learn more?
(Other definitions for name tag that I've seen before include "Identifying badge" , "ID carrier" , "A magnet (anag) - identification" , "sign of identification" , "Label proving ownership" .)