Old man receives a card: get well with it (7)
I believe the answer is:
panacea
'well with it' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'old man receives a card' is the wordplay.
'old man' becomes 'pa' (both can mean someone's father).
'receives' indicates putting letters inside (inserted letters are received).
'a' becomes 'an'.
'card' becomes 'ace' (ace is a type of playing card).
'an'+'ace'='anace'
'pa' enclosing 'anace' is 'PANACEA'.
'get' acts as a link.
Can you help me to learn more?
(Other definitions for panacea that I've seen before include "Remedy for all kinds of diseases or troubles" , "that can make anything better" , "Cure for all ills" , "A cure-all for diseases or troubles" , "that'll solve everything" .)