A 1970s musical may be heard in this country (6)
I believe the answer is:
'this country' is the definition.
(Greece is an example)
'a 1970s musical may be heard' is the wordplay.
I cannot quite see how this works, but
'heard' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
The remaining letters 'grece' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for greece that I've seen before include "European nation" , "Mediterranean country" , "Hellas is its ancient and modern name" , "in E" , "Country of southeast Europe" .)