Crossword Genius

Start working group (5)

Ross

I believe the answer is:

onset

'start' is the definition.
(onset is a kind of start)

'working group' is the wordplay.
'working' becomes 'on'.
'group' becomes 'set' (set is a kind of group).
'on'+'set'='ONSET'

(Other definitions for onset that I've seen before include "Start - notes (anag)" , "17 down [ASSAULT]" , "Initial stage; attack" , "Outbreak" , "Storming" .)

I've seen this clue in The Times and The Irish Times.
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