Joseph Bazalgette used this design to map sewer (5,5)
I believe the answer is:
steam power
'joseph bazalgette used this design' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'map sewer' is the wordplay.
I cannot quite see how this works, but
an anagram of 'map' is 'amp' which is within the answer.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
I've seen this clue in The Telegraph.
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