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Transport worker let in functions in suit (11) B-S-N-S-M-N.
I have put Businessman but can't quite see the wordplay, any help would be grateful thanks

busman/sines(functions)

businessman dresses in a suit

Looks like busman with sines it (mathematical functions, I guess).

Thanks a lot.
I could see Busman (using the first 's') and was looking at iness inside instead of using the last 's' for Busman and then getting sines.
I need to look a bit closer next time