A derelict pub, exhort to go into (6)
I believe the answer is:
beggar
'a derelict' is the definition.
(thesaurus)
'pub exhort to go into' is the wordplay.
'pub' becomes 'bar' (both are drinking establishments).
'exhort' becomes 'egg' (I can't justify this - if you can you should give a lot more credence to this answer).
'to go into' means one lot of letters goes inside another (some letters go into others).
'bar' going around 'egg' is 'BEGGAR'.
Can you help me to learn more?
(Other definitions for beggar that I've seen before include "Pauper who lives by soliciting" , "vagrant" , "Pauper or supplicant" , "Mendicant or scrounger" , "bum" .)