Unfinished plans of rowdies (6)

I believe the answer is:

roughs

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'rowdies' is the definition.
(I've seen this in another clue)

'unfinished plans' is the wordplay.
'unfinished' becomes 'rough' (associated in meaning).
'plans' becomes 's' (I can't justify this - if you can you should believe this answer much more).
'rough'+'s'='ROUGHS'

'of' acts as a link.

Can you help me to learn more?

(Another definition for roughs that I've seen is " Thugs".)

I've seen this clue in The Globe and Mail.

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