Is it here one may expect high tolls? (4,5)
I believe the answer is:
bell tower
'is it here one may expect high tolls?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'is it here one' is the wordplay.
I cannot really see how this works, but
'is' could be 'be' and 'be' is located in the answer.
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found in the answer.
'one' could be 'er' (I've seen this in other clues) and 'er' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for bell tower that I've seen before include "Campanile" , "building to encourage worshippers to come along?" .)