Watches for helpful lads (6)

I believe the answer is:

scouts

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'watches' is the definition.
(I know this)

I can't explain the rest of the clue.

(Other definitions for scouts that I've seen before include "They look out for talented people" , "Persons sent out to gather information - may be boys" , "Young people's adventure organisation" , "Lookouts or pathfinders" , "Spotters" .)

I've seen this clue in The Globe and Mail.

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