Crossword Genius

Spin merchant lying? (5)

Ross

I believe the answer is:

prone

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'lying?' is the definition.
(I've seen this before)

'spin merchant' is the wordplay.
'spin' becomes 'PR' (public relations).
'merchant' becomes 'one' (I can't explain this - if you can you should believe this answer much more).
'pr'+'one'='PRONE'

Can you help me to learn more?

(Other definitions for prone that I've seen before include "Lying flat" , "Given" , "Prostrate" , "Liable (to suffer) - lying down" , "Lying face down - inclined" .)

I've seen this clue in the Sydney Morning Herald.
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