That hungry man's pub at Ponder's End (5)
I believe the answer is:
inner
'that hungry man's' is the definition.
I can't judge whether this definition defines the answer.
'pub at ponder's end' is the wordplay.
'pub' becomes 'inn' (an inn is a type of pub).
'at' means one lot of letters go next to another.
'ponder's end' becomes 'er' (I can't justify this - if you can you should give a lot more credence to this answer).
'inn'+'er'='INNER'
Can you help me to learn more?
(Other definitions for inner that I've seen before include "Interior" , "Ring round the target bull." , "Relating to the soul, mind or spirit" , "Ring next to the bullseye" , "Internal - mental" .)