Crossword Genius

Son has no trousers (6)

Ross

I believe the answer is:

slacks

'trousers' is the definition.
(type of trousers)

'son has no' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'has no' becomes 'lacks'.
's'+'lacks'='SLACKS'

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

I've seen this clue in The Guardian and The Telegraph.
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