Crossword Genius

London area and South Herts town a must for The Archers (9)

Ross

I believe the answer is:

bowstring

'a must for the archers' is the definition.
(something needed by archers)

'london area and south herts town' is the wordplay.
'london area' becomes 'bow' (I've seen this in other clues).
'and' means one lot of letters go next to another.
'south' becomes 's' ('S' can be a synonym of 'south').
'herts town' becomes 'tring' (I've seen this before).
'bow'+'s'+'tring'='BOWSTRING'

(Another definition for bowstring that I've seen is " Missile-launcher".)

I've seen this clue in The Times.
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