Crossword Genius

Slow people boring when crossing road (8)

Ross

I believe the answer is:

dullards

'slow people' is the definition.

'boring when crossing road' is the wordplay.
'boring' becomes 'dull' ('dull' can be similar in meaning to 'boring'**).
'when' becomes 'as'.
'crossing' is an insertion indicator.
'road' becomes 'rd' (abbreviation).
'as' placed around 'rd' is 'ards'.
'dull'+'ards'='DULLARDS'

(Another definition for dullards that I've seen is " Chumps".)

I've seen this clue in The Telegraph.
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