Spent hours collecting good preliminary sketches (6)

I believe the answer is:

roughs

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

'spent hours collecting good' is the wordplay.
'spent' indicates an anagram.
'collecting' means one lot of letters goes inside another.
'good' becomes 'g' (abbreviation).
'hours' with letters rearranged gives 'rouhs'.
'rouhs' going around 'g' is 'ROUGHS'.

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

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