Crossword Genius

The son wants to get on but won't work hard (6)

Ross

I believe the answer is:

slacks

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'get on but won't work hard' is the definition.
I can't tell whether this definition defines the answer.

'the son wants' is the wordplay.
'the son' becomes 's' (genealogical abbreviation for son).
'wants' becomes 'lacks' ('lack' can be a synonym of 'want').
's'+'lacks'='SLACKS'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for slacks that I've seen before include "bags" , "takes it easy" , "casual attire" , "Works lazily; trousers" , "Pants for casual wear" .)

I've seen this clue in the Evening Standard.
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