Brad and Greg discovered off the beaten track (4)
I believe the answer is:
rare
'off the beaten track' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I don't see?
'brad and greg discovered' is the wordplay.
'brad' becomes 'ra' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' is a charade indicator (letters next to each other).
'discovered' means to look at the middle letters (dis-covered - outer letters removed).
The centre of 'greg' is 're'.
'ra'+'re'='RARE'
Can you help me to learn more?
(Other definitions for rare that I've seen before include "Exceptionable" , "Singular, infrequent" , "Very lightly cooked, meat say" , "Scarce or uncommon" , "may be bloody" .)