Possible Clues:

• Perhaps what the inspector likes - or may not like at all
• Staid set squirming with revulsion
• Backward-looking characters in streets at Sidmouth showing mild revulsion
• Is stated (anag.)
• Adverse reaction to brief experience of the underworld
• Not liking mount yet sat side-saddle part of the way
• In its stead, developed a revulsion for
• Aversion shows how Sid reverts to style
• Instead, changed the first to 'aversion'
• Feeling of dislike - unsavoury?