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Description of some deliveries supervised by a route manager, primarily (8)

Ross

I believe the answer is:

underarm

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'description of some deliveries supervised by a route manager primarily' is the definition.
I can't tell whether this defines the answer.

'supervised by a route manager primarily' is the wordplay.
'supervised by' becomes 'under' (I've seen this in another clue).
'primarily' indicates taking the first letters.
The first letters of 'route manager' is 'rm'.
'under'+'a'+'rm'='UNDERARM'

Can you help me to learn more?

(Other definitions for underarm that I've seen before include "poor delivery" , "Could such a delivery" , "Type of service" , "Neglect service" , "Bowling below shoulder level" .)

I've seen this clue in The Times.
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