Where a half wild horse gets backed?

I believe the answer is:

wigan

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'where a half wild horse gets backed?' is the definition.
The definition suggests a singular noun which matches the answer.

'where a' is the wordplay.
'where' becomes 'wig' (I can't justify this - if you can you should believe this answer much more).
'a' becomes 'an'.
'wig'+'an'='WIGAN'

Can you help me to learn more?

(Other definitions for wigan that I've seen before include "Lancashire town" , "The Road to -- Pier (Orwell)" , "Greater Manchester town with an "Athletic" football club" , "Lancashire FC" , "Town near Manchester" .)

I've seen this clue in the Evening Standard.

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