Innkeeper's profit is cheap at the price (7)
I believe the answer is:
bargain
'cheap at the price' is the definition.
I can't judge whether this definition defines the answer.
'innkeeper's profit' is the wordplay.
'innkeeper's' becomes 'bar' (I can't explain this - if you can you should give a lot more credence to this answer).
'profit' becomes 'gain' (synonyms).
'bar'+'gain'='BARGAIN'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for bargain that I've seen before include "Count on" , "Deal; cheap buy" , "Cheap acquisition" , "Deal; item at low price" , "Cheap purchase" .)