A highwayman, but did he turn out pious? (6)

I believe the answer is:

turpin

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'a highwayman' is the definition.
(I've seen this before)

'turn out pious?' is the wordplay.
'out' indicates putting letters inside.
'pious?' becomes 'pi'.
'turn' going around 'pi' is 'TURPIN'.

'but did he' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for turpin that I've seen before include "Dick ...... was a legendary highwayman" , "Dick ... was famous English highwayman" , "Dick.....was famous English highwayman" , "Dick ... was notorious English highwayman" , "One who preyed on travellers" .)

I've seen this clue in the Evening Standard.

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